Add the ability to build as a header only library

.gitignore

@@ -20,5 +20,5 @@ utemplConfigVersion.cmake
 utempl_tests
 utempl_tests\[1\]_include.cmake
 utempl_tests\[1\]_tests.cmake
-libutempl_shared.so
+libutempl.a
-libutempl_static.so
+_headers

CMakeLists.txt

@@ -12,10 +12,17 @@ set(CMAKE_CXX_STANDARD_REQUIRED ON)
 set(CMAKE_CXX_EXTENSIONS OFF)
 set(CMAKE_CXX_MODULE_STD 1)
 set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
-set(FMT_MODULE ON)
 set(BOOST_INCLUDE_LIBRARIES "pfr")
 
 option(CPM_USE_LOCAL_PACKAGES "Use local packages" ON)
+option(UTEMPL_MODULE OFF)
+
+if(UTEMPL_MODULE)
+  add_compile_definitions(UTEMPL_EXPORT=export)
+elseif()
+  add_compile_definitions(UTEMPL_EXPORT="")
+endif()
+
 file(GLOB_RECURSE SOURCES "src/*.cpp")
 
 set_target_properties(__cmake_cxx23 PROPERTIES CXX_EXTENSIONS OFF)
@@ -38,6 +45,8 @@ CPMAddPackage(
   OPTIONS "BOOST_SKIP_INSTALL_RULES OFF"
 )
 
+if(UTEMPL_MODULE)
+
 set(TMP ${CPM_USE_LOCAL_PACKAGES})
 set(CPM_USE_LOCAL_PACKAGES OFF)
 
@@ -45,29 +54,93 @@ CPMAddPackage(
   NAME fmt
   URL
   "https://github.com/linuxnyasha/fmt_import/archive/refs/heads/linuxnyasha-patch-1.zip"
+  EXCLUDE_FROM_ALL ON
+  OPTIONS "FMT_MODULE ON"
   # Fixes for fmt module and constexpr fmt::formatted_size
 )
 
 set(CPM_USE_LOCAL_PACKAGES ${TMP})
 
+else()
 
+CPMAddPackage("gh:fmtlib/fmt#11.0.2")
+
+
+endif()
 
 cmake_policy(SET CMP0079 NEW)
 
 include(GNUInstallDirs)
 
 
+file(MAKE_DIRECTORY "_headers")
+file(MAKE_DIRECTORY "_headers/utempl")
+file(MAKE_DIRECTORY "_headers/utempl/loopholes")
+if(UTEMPL_MODULE)
+  add_library(utempl STATIC)
+  target_compile_definitions(utempl PUBLIC UTEMPL_MODULE)
+  target_compile_options(utempl PUBLIC "-Wno-pragma-once-outside-header")
+  target_sources(utempl PUBLIC FILE_SET utemplModules TYPE CXX_MODULES
+  FILES ${SOURCES})
+  file(GLOB_RECURSE HEADER_SOURCES "src/*.hpp")
+  set(EXISTING_HEADERS)
 
+  foreach(HPP_FILE ${HEADER_SOURCES})
+    get_filename_component(FILE_NAME ${HPP_FILE} NAME_WE) 
+    set(HEADER_FILE "_headers/utempl/${FILE_NAME}.hpp")
+    file(READ ${HPP_FILE} FILE_CONTENT)
+    file(WRITE ${HEADER_FILE} "${FILE_CONTENT}")
+    list(APPEND EXISTING_HEADERS "${HEADER_FILE}")
+  endforeach()
+  file(GLOB HEADER_FILES "_headers/*.hpp")
+  foreach(HEADER_FILE ${HEADER_FILES})
+    if(NOT HEADER_FILE IN_LIST EXISTING_HEADERS)
+      file(REMOVE ${HEADER_FILE})
+    endif()
+  endforeach()
+  if(TARGET Boost::pfr)
+    target_link_libraries(utempl PUBLIC fmt::fmt
+      Boost::pfr)
+  else()
+    find_package(Boost 1.85.0 REQUIRED)
+    target_link_libraries(utempl PUBLIC fmt::fmt
+      ${Boost_LIBRARIES})
+  endif()
+else()
+  add_library(utempl INTERFACE)
+  file(GLOB_RECURSE HEADER_SOURCES "src/*.hpp")
+  set(EXISTING_HEADERS)
+  foreach(CPP_FILE ${SOURCES} ${HEADER_SOURCES})
+    get_filename_component(FILE_NAME ${CPP_FILE} NAME_WE) 
+    set(HEADER_FILE "_headers/utempl/${FILE_NAME}.hpp")
+    file(READ ${CPP_FILE} FILE_CONTENT)
+    file(WRITE ${HEADER_FILE} "${FILE_CONTENT}")
+    list(APPEND EXISTING_HEADERS "${HEADER_FILE}")
+
+  endforeach()
+  file(GLOB HEADER_FILES "_headers/*.hpp")
+  foreach(HEADER_FILE ${HEADER_FILES})
+    if(NOT HEADER_FILE IN_LIST EXISTING_HEADERS)
+      file(REMOVE ${HEADER_FILE})
+    endif()
+  endforeach()
+  if(TARGET Boost::pfr)
+    target_link_libraries(utempl INTERFACE fmt::fmt
+      Boost::pfr)
+  else()
+    find_package(Boost 1.85.0 REQUIRED)
+    target_link_libraries(utempl INTERFACE fmt::fmt
+      ${Boost_LIBRARIES})
+  endif()
+endif()
 
-add_library(utempl)
 add_library(utempl::utempl ALIAS utempl)
 target_compile_features(utempl INTERFACE cxx_std_23)
 
-target_include_directories(utempl INTERFACE $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include>
+target_include_directories(utempl INTERFACE
-        $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>)
+    $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/_headers>
+    $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>)
 
-target_sources(utempl PUBLIC FILE_SET utemplModules TYPE CXX_MODULES
-  FILES ${SOURCES})
 
 
 
@@ -80,16 +153,6 @@ install(TARGETS utempl
 )
 
 
-if(TARGET Boost::pfr)
-  target_link_libraries(utempl PUBLIC fmt::fmt
-    Boost::pfr)
-else()
-  find_package(Boost 1.85.0 REQUIRED)
-  target_link_libraries(utempl PUBLIC fmt::fmt
-    ${Boost_LIBRARIES})
-endif()
-
-
 
 
 
@@ -113,7 +176,7 @@ install(FILES "${PROJECT_BINARY_DIR}/utemplConfig.cmake"
               "${PROJECT_BINARY_DIR}/utemplConfigVersion.cmake"
         DESTINATION ${CMAKE_INSTALL_DATAROOTDIR}/utempl/cmake)
 
-install(DIRECTORY ${PROJECT_SOURCE_DIR}/include/utempl DESTINATION include)
+install(DIRECTORY ${PROJECT_SOURCE_DIR}/headers/utempl DESTINATION include)
 
 
 
@@ -122,8 +185,7 @@ if(ENABLE_TESTS)
   enable_testing()
   file(GLOB SOURCES tests/* tests/*/* tests/*/*/*)
   add_executable(utempl_tests)
-  target_sources(utempl_tests PUBLIC FILE_SET utempl_tests TYPE CXX_MODULES
+  target_sources(utempl_tests PUBLIC ${SOURCES})
-    FILES ${SOURCES})
   target_link_libraries(utempl_tests GTest::gtest_main utempl::utempl)
   set_property(TARGET utempl_tests PROPERTY CXX_STANDARD 23)
   include(GoogleTest)

examples/src/attributes.cpp

@@ -1,6 +1,6 @@
-import std;
+#include <utempl/utempl.hpp>
-import utempl;
 #include <utempl/macro.hpp>
+import std;
 
 template <typename T>
 struct AttributeData {

examples/src/curry.cpp

@@ -1,4 +1,4 @@
-import utempl;
+#include <utempl/utempl.hpp>
 import std;
 
 auto main() -> int {

examples/src/go_interface.cpp

@@ -1,5 +1,4 @@
-import fmt;
+#include <utempl/utempl.hpp>
-import utempl;
 import std;
 
 struct SomeInterfaceImpl {
@@ -13,7 +12,7 @@ struct SomeStruct {
 };
 
 inline auto Func(SomeInterface arg) {
-  fmt::print("{} {}\n", arg.a, arg.b);
+  std::println("{} {}\n", arg.a, arg.b);
 };
 
 auto main() -> int {

examples/src/left_fold.cpp

@@ -1,4 +1,4 @@
-import utempl;
+#include <utempl/utempl.hpp>
 import std;
 
 auto main() -> int {

examples/src/make.cpp

@@ -1,4 +1,4 @@
-import utempl;
+#include <utempl/utempl.hpp>
 import std;
 
 auto main() -> int {

examples/src/meta.cpp

@@ -1,4 +1,4 @@
-import utempl;
+#include <utempl/utempl.hpp>
 import std;
 
 auto main() -> int {

examples/src/overloaded.cpp

@@ -1,4 +1,4 @@
-import utempl;
+#include <utempl/utempl.hpp>
 import std;
 
 auto main() -> int {

examples/src/pipe.cpp

@@ -1,4 +1,4 @@
-import utempl;
+#include <utempl/utempl.hpp>
 
 struct Container {
   float data{};

examples/src/reverse.cpp

@@ -1,4 +1,4 @@
-import utempl;
+#include <utempl/utempl.hpp>
 import std;
 
 auto main() -> int {

examples/src/switch.cpp

@@ -1,4 +1,4 @@
-import utempl;
+#include <utempl/utempl.hpp>
 import std;
 
 auto main() -> int {

examples/src/times.cpp

@@ -1,4 +1,4 @@
-import utempl;
+#include <utempl/utempl.hpp>
 import std;
 
 auto main() -> int {

examples/src/tuple.cpp

@@ -1,5 +1,5 @@
 #include <cassert>
-import utempl;
+#include <utempl/utempl.hpp>
 import std;
 
 auto main() -> int {

src/attributes.cpp

@@ -1,54 +1,66 @@
+#pragma once
+#include <utempl/module.hpp>
+
+#ifdef UTEMPL_MODULE
 export module utempl.attributes;
 export import utempl.meta_info;
 export import utempl.tuple;
 export import utempl.loopholes.counter;
 import utempl.utils;
 import utempl.type_list;
+#else
+
+#include <utempl/loopholes/counter.hpp>
+#include <utempl/meta_info.hpp>
+#include <utempl/tuple.hpp>
+#include <utempl/type_list.hpp>
+#include <utempl/utils.hpp>
+#endif
 
 namespace utempl {
 
 namespace impl {
 
-export struct AttributesTag {};
+UTEMPL_EXPORT struct AttributesTag {};
 
-export template <typename T>
+UTEMPL_EXPORT template <typename T>
 struct AttributesCounterTag {};
 
 }  // namespace impl
 
-export template <typename T, typename..., auto f = [] {}, auto = AddTypeToTag<impl::AttributesTag, T, decltype(f)>()>
+UTEMPL_EXPORT template <typename T, typename..., auto f = [] {}, auto = AddTypeToTag<impl::AttributesTag, T, decltype(f)>()>
 consteval auto OpenStruct() -> bool {
   return true;
 };
 
-export template <typename...,
+UTEMPL_EXPORT template <typename...,
-                 auto f = [] {},
+                        auto f = [] {},
-                 auto I = loopholes::CountValue<impl::AttributesTag, decltype(f)>(),
+                        auto I = loopholes::CountValue<impl::AttributesTag, decltype(f)>(),
-                 auto II = (I >= 2) ? I - 2 : I - 1,
+                        auto II = (I >= 2) ? I - 2 : I - 1,
-                 typename T = decltype(Magic(loopholes::Getter<MetaInfoKey<II, impl::AttributesTag>{}>{}))::Type,
+                        typename T = decltype(Magic(loopholes::Getter<MetaInfoKey<II, impl::AttributesTag>{}>{}))::Type,
-                 auto = AddTypeToTag<impl::AttributesTag, T, decltype(f)>()>
+                        auto = AddTypeToTag<impl::AttributesTag, T, decltype(f)>()>
 consteval auto CloseStruct() -> bool {
   return true;
 };
 
-export struct NoInfo {
+UTEMPL_EXPORT struct NoInfo {
   consteval auto operator==(const NoInfo&) const -> bool = default;
 };
 
-export template <typename T,
+UTEMPL_EXPORT template <typename T,
-                 typename O = TypeList<>,
+                        typename O = TypeList<>,
-                 auto f = [] {},
+                        auto f = [] {},
-                 typename Current = decltype(GetCurrentTagType<impl::AttributesTag, decltype(f)>())::Type,
+                        typename Current = decltype(GetCurrentTagType<impl::AttributesTag, decltype(f)>())::Type,
-                 auto = AddTypeToTag<impl::AttributesCounterTag<Current>, O, decltype(f)>()>
+                        auto = AddTypeToTag<impl::AttributesCounterTag<Current>, O, decltype(f)>()>
 using FieldAttribute = T;
 
-export template <typename T, auto f = [] {}, bool R = (loopholes::CountValue<impl::AttributesCounterTag<T>, decltype(f)>() > 0)>
+UTEMPL_EXPORT template <typename T, auto f = [] {}, bool R = (loopholes::CountValue<impl::AttributesCounterTag<T>, decltype(f)>() > 0)>
 concept HasAttributes = R;
 
-export template <typename T>
+UTEMPL_EXPORT template <typename T>
 concept HasMacroAttributes = requires { T::template GetAttribute<0>(); };
 
-export template <HasAttributes T>
+UTEMPL_EXPORT template <HasAttributes T>
 consteval auto GetAttributes()
   requires HasMacroAttributes<T>
 {
@@ -58,7 +70,7 @@ consteval auto GetAttributes()
   } | kSeq<I>;
 };
 
-export template <typename T>
+UTEMPL_EXPORT template <typename T>
 consteval auto GetAttributes() {
   constexpr auto I = loopholes::CountValue<impl::AttributesCounterTag<T>>();
   return

src/constexpr_string.cpp

@@ -1,9 +1,16 @@
+#pragma once
+#include <utempl/module.hpp>
+#ifdef UTEMPL_MODULE
 export module utempl.string;
 import std;
-// import fmt;
+#else
+#include <algorithm>
+#include <string>
+#endif
 
-export namespace utempl {
+UTEMPL_EXPORT_BEGIN
 
+namespace utempl {
 template <std::size_t Size>
 struct ConstexprString {
   std::array<char, Size> data;
@@ -78,3 +85,5 @@ constexpr auto CreateStringWith(char c) {
 template <std::size_t Size>
 ConstexprString(const char (&data)[Size]) -> ConstexprString<Size>;  // NOLINT
 }  // namespace utempl
+
+UTEMPL_EXPORT_END

src/go_interface.cpp

@@ -1,9 +1,21 @@
+#pragma once
+#include <utempl/module.hpp>
+
+#ifdef UTEMPL_MODULE
+
 module;
 #include <boost/pfr.hpp>
 export module utempl.go_interface;
 import std;
 import utempl.string;
 
+#else
+
+#include <boost/pfr.hpp>
+#include <utempl/constexpr_string.hpp>
+
+#endif
+
 namespace utempl {
 
 template <ConstexprString name, typename T>
@@ -40,7 +52,7 @@ constexpr auto Transform(Transformer&& transformer, From&& from) {
   }(std::make_index_sequence<boost::pfr::tuple_size_v<To>>());
 };
 
-export struct DefaultFieldTransformer {
+UTEMPL_EXPORT struct DefaultFieldTransformer {
   constexpr auto operator()(auto&& arg) -> auto&& {
     return arg;
   };
@@ -53,7 +65,7 @@ export struct DefaultFieldTransformer {
   };
 };
 
-export template <typename Value, typename Transformer = DefaultFieldTransformer>
+UTEMPL_EXPORT template <typename Value, typename Transformer = DefaultFieldTransformer>
 struct GoInterface : Value {
   constexpr GoInterface(Value&& value) : Value(std::move(value)) {};  // NOLINT
   constexpr GoInterface(const Value& value) : Value(value) {};        // NOLINT

src/loopholes/core.cpp

@@ -1,20 +1,32 @@
+#pragma once
+
+#include <utempl/module.hpp>
+
+#ifdef UTEMPL_MODULE
+
 export module utempl.loopholes.core;
 import std;
 
+#else
+
+#include <type_traits>
+
+#endif
+
 namespace utempl::loopholes {
 
-export {
+UTEMPL_EXPORT_BEGIN
-  template <auto I>
+template <auto I>
-  struct Getter {
+struct Getter {
-    friend constexpr auto Magic(Getter<I>);
+  friend constexpr auto Magic(Getter<I>);
+};
+template <auto I, auto Value = 0>
+struct Injector {
+  friend constexpr auto Magic(Getter<I>) {
+    return Value;
   };
-  template <auto I, auto Value = 0>
+};
-  struct Injector {
+UTEMPL_EXPORT_END
-    friend constexpr auto Magic(Getter<I>) {
-      return Value;
-    };
-  };
-}
 template <auto, typename = void, typename... Ts>
 struct InjectedImpl {
   static constexpr bool value = false;
@@ -24,7 +36,7 @@ struct InjectedImpl<V, std::void_t<decltype(Magic(Getter<V>{}))>, Ts...> {
   static constexpr bool value = true;
 };
 
-export template <auto I, typename... Ts>
+UTEMPL_EXPORT template <auto I, typename... Ts>
 concept Injected = InjectedImpl<I, void, Ts...>::value;
 
 }  // namespace utempl::loopholes

src/loopholes/counter.cpp

@@ -1,7 +1,21 @@
+#pragma once
+
+#include <utempl/module.hpp>
+
+#ifdef UTEMPL_MODULE
+
 export module utempl.loopholes.counter;
 export import utempl.loopholes.core;
 import std;
 
+
+#else
+
+#include <utempl/loopholes/core.hpp>
+#include <utility>
+
+#endif
+
 namespace utempl::loopholes {
 
 template <typename Tag, std::size_t Value>

src/loopholes/loopholes.cpp

@@ -1,3 +1,11 @@
+#pragma once
+#ifdef UTEMPL_MODULE
+
 export module utempl.loopholes;
 export import utempl.loopholes.core;
 export import utempl.loopholes.counter;
+
+#else
+#include <utempl/loopholes/core.hpp>
+#include <utempl/loopholes/counter.hpp>
+#endif

src/meta_info.cpp

@@ -1,16 +1,23 @@
+#pragma once
+#ifdef UTEMPL_MODULE
 export module utempl.meta_info;
 import utempl.loopholes;
 import utempl.type_list;
 import std;
+#else
+#include <utempl/loopholes/counter.hpp>
+#include <utempl/module.hpp>
+#include <utempl/type_list.hpp>
+#endif
 
 namespace utempl {
 
-export struct Types {};
+UTEMPL_EXPORT struct Types {};
 
-export template <std::size_t Id, typename Tag>
+UTEMPL_EXPORT template <std::size_t Id, typename Tag>
 struct MetaInfoKey {};
 
-export template <typename T, typename Tag = Types>
+UTEMPL_EXPORT template <typename T, typename Tag = Types>
 struct MetaInfo {
   static constexpr std::size_t kTypeId = loopholes::Counter<Tag, T>();
   using Type = T;
@@ -19,23 +26,23 @@ struct MetaInfo {
   static constexpr auto _ = loopholes::Injector<MetaInfoKey<kTypeId, Tag>{}, TypeList<T>{}>{};
 };
 
-export template <typename T, typename Tag = Types>
+UTEMPL_EXPORT template <typename T, typename Tag = Types>
 inline constexpr std::size_t kTypeId = MetaInfo<T, Tag>::kTypeId;
 
-export template <typename Tag,
+UTEMPL_EXPORT template <typename Tag,
-                 typename T,
+                        typename T,
-                 typename... Ts,
+                        typename... Ts,
-                 typename... TTs,
+                        typename... TTs,
-                 std::size_t Id = loopholes::Counter<Tag, T, Ts..., TTs...>(),
+                        std::size_t Id = loopholes::Counter<Tag, T, Ts..., TTs...>(),
-                 auto = loopholes::Injector<MetaInfoKey<Id, Tag>{}, TypeList<T>{}>{}>
+                        auto = loopholes::Injector<MetaInfoKey<Id, Tag>{}, TypeList<T>{}>{}>
 consteval auto AddTypeToTag(TTs&&...) -> std::size_t {
   return Id;
 };
 
-export template <std::size_t Id, typename Tag = Types>
+UTEMPL_EXPORT template <std::size_t Id, typename Tag = Types>
 using GetMetaInfo = MetaInfo<typename decltype(Magic(loopholes::Getter<MetaInfoKey<Id, Tag>{}>{}))::Type>;
 
-export template <std::size_t Id, typename Tag = Types>
+UTEMPL_EXPORT template <std::size_t Id, typename Tag = Types>
 using GetType = GetMetaInfo<Id, Tag>::Type;
 
 template <typename Tag, std::size_t I = 0, typename... Ts, typename G>
@@ -55,12 +62,12 @@ static consteval auto GetTypeListForTag(G g)
   };
 };
 
-export template <typename Tag = Types, typename... Ts>
+UTEMPL_EXPORT template <typename Tag = Types, typename... Ts>
 consteval auto GetTypeListForTag() {
   return GetTypeListForTag<Tag>(TypeList<Ts...>{});
 };
 
-export template <typename Tag, typename... Ts, auto I = utempl::loopholes::CountValue<Tag, Ts...>() - 1>
+UTEMPL_EXPORT template <typename Tag, typename... Ts, auto I = utempl::loopholes::CountValue<Tag, Ts...>() - 1>
 consteval auto GetCurrentTagType() {
   return Magic(utempl::loopholes::Getter<MetaInfoKey<I, Tag>{}>());
 };

src/optional.cpp

@@ -1,9 +1,18 @@
+#pragma once
+#include <utempl/module.hpp>
+#ifdef UTEMPL_MODULE
 export module utempl.optional;
 import std;
 
+#else
+
+#include <optional>
+
+#endif
+
 namespace utempl {
 
-export template <typename T>
+UTEMPL_EXPORT template <typename T>
 struct Optional {  // NOLINT
   bool flag = false;
   union {

src/overloaded.cpp

@@ -1,8 +1,16 @@
+#pragma once
+#include <utempl/module.hpp>
+
+#ifdef UTEMPL_MODULE
 export module utempl.overloaded;
 import std;
 
+#else
+#include <type_traits>
+#endif
+
 namespace utempl {
-export template <typename... Fs>
+UTEMPL_EXPORT template <typename... Fs>
 constexpr auto Overloaded(Fs&&... fs) {
   struct Overloaded : public std::remove_cvref_t<Fs>... {
     using Fs::operator()...;

src/tuple.cpp

@@ -1,12 +1,21 @@
+#pragma once
+
+#include <utempl/module.hpp>
+#ifdef UTEMPL_MODULE
+
 export module utempl.tuple;
 
 import utempl.type_list;
 import utempl.overloaded;
 import std;
+#else
+#include <utempl/type_list.hpp>
+#include <utility>
+#endif
 
 namespace utempl {
 
-export template <auto Value>
+UTEMPL_EXPORT template <auto Value>
 struct Wrapper {
   static constexpr auto kValue = Value;
   static constexpr auto value = Value;
@@ -35,10 +44,10 @@ struct TupleHelper<std::index_sequence<Is...>, Ts...> : public TupleLeaf<Is, Ts>
   constexpr auto operator==(const TupleHelper&) const -> bool = default;
 };
 
-export template <typename... Ts>
+UTEMPL_EXPORT template <typename... Ts>
 struct Tuple;
 
-export template <std::size_t I, typename... Ts>
+UTEMPL_EXPORT template <std::size_t I, typename... Ts>
 constexpr auto Get(Tuple<Ts...>& tuple) -> auto&
   requires(I < sizeof...(Ts))
 {
@@ -46,7 +55,7 @@ constexpr auto Get(Tuple<Ts...>& tuple) -> auto&
   return static_cast<TupleLeaf<I, Type>&>(tuple).value;
 };
 
-export template <std::size_t I, typename... Ts>
+UTEMPL_EXPORT template <std::size_t I, typename... Ts>
 constexpr auto Get(const Tuple<Ts...>& tuple) -> const auto&
   requires(I < sizeof...(Ts))
 {
@@ -54,7 +63,7 @@ constexpr auto Get(const Tuple<Ts...>& tuple) -> const auto&
   return static_cast<const TupleLeaf<I, Type>&>(tuple).value;
 };
 
-export template <std::size_t I, typename... Ts>
+UTEMPL_EXPORT template <std::size_t I, typename... Ts>
 constexpr auto Get(Tuple<Ts...>&& tuple) -> decltype(auto)
   requires(I < sizeof...(Ts))
 {
@@ -62,12 +71,12 @@ constexpr auto Get(Tuple<Ts...>&& tuple) -> decltype(auto)
   return std::move(static_cast<TupleLeaf<I, Type>&&>(tuple).value);
 };
 
-export template <std::size_t I, typename T>
+UTEMPL_EXPORT template <std::size_t I, typename T>
 constexpr auto Get(T&& arg) -> decltype(get<I>(std::forward<T>(arg))) {
   return get<I>(std::forward<T>(arg));
 };
 
-export template <typename... Ts>
+UTEMPL_EXPORT template <typename... Ts>
 struct Tuple : TupleHelper<std::index_sequence_for<Ts...>, Ts...> {
   template <typename... TTs>
   constexpr Tuple(TTs&&... args) /* NOLINT */ : TupleHelper<std::index_sequence_for<Ts...>, Ts...>{{std::forward<TTs>(args)}...} {};
@@ -106,7 +115,7 @@ struct Tuple : TupleHelper<std::index_sequence_for<Ts...>, Ts...> {
   };
 };
 
-export template <>
+UTEMPL_EXPORT template <>
 struct Tuple<> {
   template <typename... Ts>
   constexpr auto operator+(const Tuple<Ts...>& other) const -> Tuple<Ts...> {
@@ -116,10 +125,10 @@ struct Tuple<> {
     return true;
   };
 };
-export template <typename... Ts>
+UTEMPL_EXPORT template <typename... Ts>
 Tuple(Ts&&...) -> Tuple<std::decay_t<Ts>...>;
 
-export template <typename... Ts>
+UTEMPL_EXPORT template <typename... Ts>
 consteval auto ListFromTuple(Tuple<Ts...>) -> TypeList<Ts...> {
   return {};
 };

src/type_list.cpp

@@ -1,25 +1,36 @@
+#pragma once
+
+#include <utempl/module.hpp>
+#ifdef UTEMPL_MODULE
+
 export module utempl.type_list;
 
 import std;
 import utempl.overloaded;
+#else
+
+#include <algorithm>
+#include <utempl/overloaded.hpp>
+
+#endif
 
 namespace utempl {
 
-export template <typename... Ts>
+UTEMPL_EXPORT template <typename... Ts>
 struct TypeList {};
 
-export template <typename T>
+UTEMPL_EXPORT template <typename T>
 struct TypeList<T> {
   using Type = T;
 };
 
-export template <typename T>
+UTEMPL_EXPORT template <typename T>
 inline constexpr auto kType = TypeList<T>{};
 
-export template <typename... Ts>
+UTEMPL_EXPORT template <typename... Ts>
 inline constexpr auto kTypeList = TypeList<Ts...>{};
 
-export template <typename T>
+UTEMPL_EXPORT template <typename T>
 concept IsTypeList = Overloaded(
     []<typename... Ts>(TypeList<TypeList<Ts...>>) {
       return true;
@@ -37,45 +48,45 @@ struct Caster {};
 template <std::size_t... Is, typename... Ts>
 struct Caster<std::index_sequence<Is...>, Ts...> : IndexedType<Is, Ts>... {};
 
-export template <typename... Ts, typename... TTs>
+UTEMPL_EXPORT template <typename... Ts, typename... TTs>
 consteval auto operator==(const TypeList<Ts...>& first, const TypeList<TTs...>& second) -> bool {
   return std::same_as<decltype(first), decltype(second)>;
 };
 
-export template <typename... Ts, typename... TTs>
+UTEMPL_EXPORT template <typename... Ts, typename... TTs>
 consteval auto operator+(const TypeList<Ts...>&, const TypeList<TTs...>&) -> TypeList<Ts..., TTs...> {
   return {};
 };
 
-export template <std::size_t I, typename... Ts>
+UTEMPL_EXPORT template <std::size_t I, typename... Ts>
 consteval auto Get(TypeList<Ts...>) -> decltype([]<typename T>(IndexedType<I, T>&&) -> T {
 }(Caster<std::index_sequence_for<Ts...>, Ts...>{}));
 
-export template <typename T, typename... Ts>
+UTEMPL_EXPORT template <typename T, typename... Ts>
 consteval auto Find(TypeList<Ts...>) -> std::size_t {
   std::array<bool, sizeof...(Ts)> arr{std::same_as<T, Ts>...};
   return std::ranges::find(arr, true) - arr.begin();
 };
 
-export template <template <typename...> typename F, typename... Ts>
+UTEMPL_EXPORT template <template <typename...> typename F, typename... Ts>
 consteval auto Find(TypeList<Ts...>) -> std::size_t {
   std::array<bool, sizeof...(Ts)> arr{F<Ts>::value...};
   return std::ranges::find(arr, true) - arr.begin();
 };
 
-export template <typename... Ts>
+UTEMPL_EXPORT template <typename... Ts>
 consteval auto Reverse(TypeList<Ts...> list) {
   return [&]<auto... Is>(std::index_sequence<Is...>) -> TypeList<decltype(Get<sizeof...(Ts) - Is - 1>(list))...> {
     return {};
   }(std::index_sequence_for<Ts...>());
 };
 
-export template <typename... Ts>
+UTEMPL_EXPORT template <typename... Ts>
 consteval auto Transform(TypeList<Ts...>, auto&& f) -> TypeList<decltype(f(TypeList<Ts>{}))...> {
   return {};
 };
 
-export template <typename... Ts>
+UTEMPL_EXPORT template <typename... Ts>
 consteval auto FilterTypeList(TypeList<Ts...>, auto&& f) {
   return ((kTypeList<> +
            [](auto&& list) {
@@ -88,12 +99,12 @@ consteval auto FilterTypeList(TypeList<Ts...>, auto&& f) {
           ...);
 };
 
-export template <typename... Ts>
+UTEMPL_EXPORT template <typename... Ts>
 consteval auto Size(TypeList<Ts...>) -> std::size_t {
   return sizeof...(Ts);
 };
 
-export template <std::size_t N, std::size_t From = 0, typename... Ts>
+UTEMPL_EXPORT template <std::size_t N, std::size_t From = 0, typename... Ts>
 consteval auto TakeFrom(TypeList<Ts...> list)
   requires(N + From <= sizeof...(Ts))
 {
@@ -102,12 +113,12 @@ consteval auto TakeFrom(TypeList<Ts...> list)
   }(std::make_index_sequence<N>());
 };
 
-export template <typename T, std::size_t N, typename... Ts>
+UTEMPL_EXPORT template <typename T, std::size_t N, typename... Ts>
 consteval auto PushTo(TypeList<Ts...> list) {
   return TakeFrom<N>(list) + kType<T> + TakeFrom<sizeof...(Ts) - N, N>(list);
 };
 
-export template <std::size_t N, typename... Ts>
+UTEMPL_EXPORT template <std::size_t N, typename... Ts>
 consteval auto Erase(TypeList<Ts...> list) {
   return TakeFrom<N>(list) + TakeFrom<sizeof...(Ts) - N - 1, N + 1>(list);
 };

src/utempl.hpp

@@ -0,0 +1,6 @@
+#pragma once
+#ifdef UTEMPL_MODULE
+import utempl;
+#else
+#include <utempl/utempl_module.hpp>
+#endif

src/utempl_module.cpp

@@ -0,0 +1,29 @@
+#pragma once
+
+#ifdef UTEMPL_MODULE
+
+export module utempl;
+export import utempl.type_list;
+export import utempl.tuple;
+export import utempl.string;
+export import utempl.loopholes;
+export import utempl.attributes;
+export import utempl.meta_info;
+export import utempl.overloaded;
+export import utempl.utils;
+export import utempl.go_interface;
+export import utempl.optional;
+
+#else
+#include <utempl/attributes.hpp>
+#include <utempl/constexpr_string.hpp>
+#include <utempl/go_interface.hpp>
+#include <utempl/loopholes/counter.hpp>
+#include <utempl/macro.hpp>
+#include <utempl/meta_info.hpp>
+#include <utempl/optional.hpp>
+#include <utempl/overloaded.hpp>
+#include <utempl/tuple.hpp>
+#include <utempl/type_list.hpp>
+
+#endif

src/utils.cpp

@@ -1,5 +1,9 @@
-export module utempl.utils;
+#pragma once
 
+#include <utempl/module.hpp>
+
+#ifdef UTEMPL_MODULE
+export module utempl.utils;
 import std;
 import fmt;
 import utempl.string;
@@ -7,21 +11,30 @@ import utempl.tuple;
 import utempl.type_list;
 import utempl.overloaded;
 
+#else
+
+#include <utempl/constexpr_string.hpp>
+#include <utempl/overloaded.hpp>
+#include <utempl/tuple.hpp>
+#include <utempl/type_list.hpp>
+
+#endif
+
 namespace utempl {
 
 template <typename T>
 using ForwardType = decltype(std::forward<T>(std::declval<T>()));
 
-export template <auto Value>
+UTEMPL_EXPORT template <auto Value>
 constexpr Wrapper<Value> kWrapper;
 
-export template <typename T>
+UTEMPL_EXPORT template <typename T>
   requires std::same_as<T, void> || requires { T{}; }
 constexpr auto kDefaultCreator = [] {
   return T{};
 };
 
-export template <>
+UTEMPL_EXPORT template <>
 constexpr auto kDefaultCreator<void> = [] {};
 
 template <std::size_t N>
@@ -47,7 +60,7 @@ concept Function = []<typename R, typename... Ts>(TypeList<R(Ts...)>) {
 
 static_assert(Function<decltype([]() {}), void()>);
 
-export template <std::size_t N>
+UTEMPL_EXPORT template <std::size_t N>
 constexpr kSeqType<N> kSeq;
 
 template <ConstexprString string, typename T = std::size_t>
@@ -62,14 +75,14 @@ consteval auto ParseNumber() -> T {
 };
 namespace literals {
 
-export template <char... cs>
+UTEMPL_EXPORT template <char... cs>
 consteval auto operator"" _c() {
   return Wrapper<ParseNumber<ConstexprString<sizeof...(cs)>({cs...})>()>{};
 };
 
 }  // namespace literals
 
-export template <std::size_t I, typename... Ts>
+UTEMPL_EXPORT template <std::size_t I, typename... Ts>
 constexpr auto Arg(Ts&&... args) -> decltype(auto)
   requires(I < sizeof...(Ts))
 {
@@ -80,52 +93,52 @@ constexpr auto Arg(Ts&&... args) -> decltype(auto)
   }(std::make_index_sequence<I>());
 };
 
-export template <std::size_t Count>
+UTEMPL_EXPORT template <std::size_t Count>
 constexpr auto Times(auto&& f) {
   [&]<auto... Is>(std::index_sequence<Is...>) {
     (Arg<0>(f, Is)(), ...);
   }(std::make_index_sequence<Count>());
 };
 
-export template <typename T>
+UTEMPL_EXPORT template <typename T>
 constexpr std::size_t kTupleSize = []() -> std::size_t {
   static_assert(!sizeof(T), "Not Found");
   return 0;
 }();
 
-export template <typename T>
+UTEMPL_EXPORT template <typename T>
 constexpr std::size_t kTupleSize<T&&> = kTupleSize<std::remove_reference_t<T>>;
 
-export template <typename T>
+UTEMPL_EXPORT template <typename T>
 constexpr std::size_t kTupleSize<T&> = kTupleSize<std::remove_reference_t<T>>;
 
-export template <typename T>
+UTEMPL_EXPORT template <typename T>
 constexpr std::size_t kTupleSize<const T> = kTupleSize<std::remove_cv_t<T>>;
 
-export template <template <typename...> typename M, typename... Ts>
+UTEMPL_EXPORT template <template <typename...> typename M, typename... Ts>
 constexpr std::size_t kTupleSize<M<Ts...>> = sizeof...(Ts);
 
-export template <template <typename, std::size_t> typename Array, typename T, std::size_t N>
+UTEMPL_EXPORT template <template <typename, std::size_t> typename Array, typename T, std::size_t N>
 constexpr std::size_t kTupleSize<Array<T, N>> = N;
 
-export template <typename T>
+UTEMPL_EXPORT template <typename T>
 struct TupleMaker {};
 
-export template <typename... Ts>
+UTEMPL_EXPORT template <typename... Ts>
 struct TupleMaker<std::tuple<Ts...>> {
   template <typename... Args>
   static constexpr auto Make(Args&&... args) {
     return std::tuple{std::forward<Args>(args)...};
   };
 };
-export template <typename... Ts>
+UTEMPL_EXPORT template <typename... Ts>
 struct TupleMaker<Tuple<Ts...>> {
   template <typename... Args>
   static constexpr auto Make(Args&&... args) {
     return Tuple{std::forward<Args>(args)...};
   };
 };
-export template <typename T, std::size_t N>
+UTEMPL_EXPORT template <typename T, std::size_t N>
 struct TupleMaker<std::array<T, N>> {
   template <typename Arg, typename... Args>
   static constexpr auto Make(Arg&& arg, Args&&... args)
@@ -138,10 +151,10 @@ struct TupleMaker<std::array<T, N>> {
   };
 };
 
-export template <typename T>
+UTEMPL_EXPORT template <typename T>
 struct TupleTieMaker {};
 
-export template <typename... Ts>
+UTEMPL_EXPORT template <typename... Ts>
 struct TupleTieMaker<std::tuple<Ts...>> {
   template <typename... Args>
   static constexpr auto Make(Args&... args) -> std::tuple<Args...> {
@@ -149,7 +162,7 @@ struct TupleTieMaker<std::tuple<Ts...>> {
   };
 };
 
-export template <typename... Ts>
+UTEMPL_EXPORT template <typename... Ts>
 struct TupleTieMaker<Tuple<Ts...>> {
   template <typename... Args>
   static constexpr auto Make(Args&... args) -> Tuple<Args...> {
@@ -157,12 +170,12 @@ struct TupleTieMaker<Tuple<Ts...>> {
   };
 };
 
-export template <typename T = Tuple<>, typename... Args>
+UTEMPL_EXPORT template <typename T = Tuple<>, typename... Args>
 constexpr auto MakeTuple(Args&&... args) -> decltype(TupleMaker<std::remove_cvref_t<T>>::Make(std::forward<Args>(args)...)) {
   return TupleMaker<std::remove_cvref_t<T>>::Make(std::forward<Args>(args)...);
 };
 
-export template <typename T = Tuple<>, typename... Args>
+UTEMPL_EXPORT template <typename T = Tuple<>, typename... Args>
 constexpr auto MakeTie(Args&... args) -> decltype(TupleTieMaker<std::remove_cvref_t<T>>::Make(args...)) {
   return TupleTieMaker<std::remove_cvref_t<T>>::Make(args...);
 };
@@ -210,17 +223,17 @@ struct IsSafeTuple<
   static constexpr bool value = false;
 };
 
-export template <typename T>
+UTEMPL_EXPORT template <typename T>
 constexpr bool kForceEnableTuple = false;
 
-export template <typename T, std::size_t N>
+UTEMPL_EXPORT template <typename T, std::size_t N>
 constexpr bool kForceEnableTuple<std::array<T, N>> = true;
 
-export template <typename T>
+UTEMPL_EXPORT template <typename T>
 concept TupleLike = kForceEnableTuple<std::remove_cvref_t<T>> ||
                     (requires { Get<0>(MakeTuple<T>(42)); } && IsSafeTuple<std::remove_cvref_t<T>>::value);  // NOLINT
 
-export template <typename F, typename Tuple>
+UTEMPL_EXPORT template <typename F, typename Tuple>
 concept TupleTransformer = requires(F f, Tuple&& tuple) {
   { f(std::move(tuple)) };
 };
@@ -304,7 +317,7 @@ struct TupleMaker<LazyTuple<F>> {
   };
 };
 
-export template <TupleLike Tuple, TupleTransformer<Tuple> FF>
+UTEMPL_EXPORT template <TupleLike Tuple, TupleTransformer<Tuple> FF>
 constexpr auto operator|(Tuple&& tuple, FF&& f) {
   return LazyTuple{[tuple = std::forward<Tuple>(tuple), f = std::forward<FF>(f)]() -> decltype(auto) {
     return f(std::move(tuple));
@@ -331,14 +344,14 @@ concept ForEachConcept = []<std::size_t... Is>(std::index_sequence<Is...>) {
   return (std::invocable<F, decltype(Get<Is>(std::declval<Tuple>()))> && ...);
 }(std::make_index_sequence<kTupleSize<Tuple>>());
 
-export template <TupleLike Tuple, UnpackConcept<Tuple> F>
+UTEMPL_EXPORT template <TupleLike Tuple, UnpackConcept<Tuple> F>
 constexpr auto Unpack(Tuple&& tuple, F&& f) -> decltype(auto) {
   return [&](auto... is) -> decltype(auto) {
     return f(Get<is>(std::forward<Tuple>(tuple))...);
   } | kSeq<kTupleSize<Tuple>>;
 };
 
-export template <typename F>
+UTEMPL_EXPORT template <typename F>
 constexpr auto Unpack(F&& f) {
   return [f = std::forward<F>(f)]<TupleLike Tuple>(Tuple&& tuple) -> decltype(auto)
            requires UnpackConcept<F, Tuple>
@@ -347,14 +360,14 @@ constexpr auto Unpack(F&& f) {
   };
 };
 
-export template <TupleLike Tuple, TupleLike R = Tuple, TransformConcept<Tuple> F>
+UTEMPL_EXPORT template <TupleLike Tuple, TupleLike R = Tuple, TransformConcept<Tuple> F>
 constexpr auto Transform(Tuple&& container, F&& f, TypeList<R> = {}) {
   return Unpack(std::forward<Tuple>(container), [&]<typename... Ts>(Ts&&... args) {
     return MakeTuple<R>(f(std::forward<Ts>(args))...);
   });
 };
 
-export template <typename F, typename R = void>
+UTEMPL_EXPORT template <typename F, typename R = void>
 constexpr auto Transform(F&& f, TypeList<R> result = {}) {
   return [f = std::forward<F>(f), result]<TupleLike TTuple, typename RR = decltype([] {
                                                               if constexpr(std::same_as<R, void>) {
@@ -369,17 +382,17 @@ constexpr auto Transform(F&& f, TypeList<R> result = {}) {
   };
 };
 
-export template <TupleLike Tuple, TupleLike R = Tuple, TransformConcept<Tuple> F>
+UTEMPL_EXPORT template <TupleLike Tuple, TupleLike R = Tuple, TransformConcept<Tuple> F>
 constexpr auto Map(Tuple&& tuple, F&& f, TypeList<R> result = {}) {
   return Transform(std::forward<Tuple>(tuple), std::forward<F>(f), result);
 };
 
-export template <typename F, typename R = void>
+UTEMPL_EXPORT template <typename F, typename R = void>
 constexpr auto Map(F&& f, TypeList<R> result = {}) -> decltype(Transform(std::forward<F>(f), result)) {
   return Transform(std::forward<F>(f), result);
 };
 
-export template <auto Tuple, TupleLike To = decltype(Tuple)>
+UTEMPL_EXPORT template <auto Tuple, TupleLike To = decltype(Tuple)>
 consteval auto PackConstexprWrapper()
   requires TupleLike<decltype(Tuple)>
 {
@@ -388,14 +401,14 @@ consteval auto PackConstexprWrapper()
   }(std::make_index_sequence<kTupleSize<decltype(Tuple)>>());
 };
 
-export template <TupleLike Tuple>
+UTEMPL_EXPORT template <TupleLike Tuple>
 constexpr auto Reverse(Tuple&& tuple) {
   return [&]<std::size_t... Is>(std::index_sequence<Is...>) {
     return MakeTuple<Tuple>(Get<kTupleSize<Tuple> - Is - 1>(std::forward<Tuple>(tuple))...);
   }(std::make_index_sequence<kTupleSize<Tuple>>());
 };
 
-export consteval auto Reverse() {
+UTEMPL_EXPORT consteval auto Reverse() {
   return []<TupleLike Tuple>(Tuple&& tuple) {
     return Reverse(std::forward<Tuple>(tuple));
   };
@@ -443,7 +456,7 @@ concept LeftFoldConcept = decltype(Unpack(std::declval<Tuple>(), []<typename...
   return kWrapper<decltype((LeftFoldIsOk<F, T>{} | ... | LeftFoldIsOk<F, Ts>{}))::value>;
 }))::kValue;
 
-export template <TupleLike Tuple, std::move_constructible T, LeftFoldConcept<T, Tuple> F = decltype(kDefaultCreator<void>)&>
+UTEMPL_EXPORT template <TupleLike Tuple, std::move_constructible T, LeftFoldConcept<T, Tuple> F = decltype(kDefaultCreator<void>)&>
 constexpr auto LeftFold(Tuple&& tuple, T&& init, F&& f = kDefaultCreator<void>) -> decltype(auto) {
   return Unpack(std::forward<Tuple>(tuple), [&]<typename... Ts>(Ts&&... args) -> decltype(auto) {
     return (LeftFoldHelper<ForwardType<T>, ForwardType<F>>{.data = std::forward<T>(init), .f = std::forward<F>(f)} | ... |
@@ -452,12 +465,12 @@ constexpr auto LeftFold(Tuple&& tuple, T&& init, F&& f = kDefaultCreator<void>)
   });
 };
 
-export template <TupleLike Tuple, std::move_constructible T, LeftFoldConcept<T, Tuple> F>
+UTEMPL_EXPORT template <TupleLike Tuple, std::move_constructible T, LeftFoldConcept<T, Tuple> F>
 constexpr auto Reduce(Tuple&& tuple, T&& init, F&& f) -> decltype(auto) {
   return LeftFold(std::forward<Tuple>(tuple), std::forward<T>(init), std::forward<F>(f));
 };
 
-export template <typename T, typename F>
+UTEMPL_EXPORT template <typename T, typename F>
 constexpr auto Reduce(T&& init, F&& f) -> decltype(auto) {
   return [init = std::forward<T>(init), f = std::forward<F>(f)]<TupleLike Tuple>(Tuple&& tuple) -> decltype(auto)
            requires LeftFoldConcept<F, T, Tuple>
@@ -466,14 +479,14 @@ constexpr auto Reduce(T&& init, F&& f) -> decltype(auto) {
   };
 };
 
-export template <TupleLike Tuple, TupleLike Tuple2>
+UTEMPL_EXPORT template <TupleLike Tuple, TupleLike Tuple2>
 constexpr auto TupleCat(Tuple&& tuple, Tuple2&& tuple2) {
   return [&]<auto... Is, auto... IIs>(std::index_sequence<Is...>, std::index_sequence<IIs...>) {
     return MakeTuple<Tuple>(Get<Is>(std::forward<Tuple>(tuple))..., Get<IIs>(std::forward<Tuple2>(tuple2))...);
   }(std::make_index_sequence<kTupleSize<Tuple>>(), std::make_index_sequence<kTupleSize<Tuple2>>());
 };
 
-export template <TupleLike... Tuples>
+UTEMPL_EXPORT template <TupleLike... Tuples>
 constexpr auto TupleCat(Tuples&&... tuples)
   requires(sizeof...(tuples) >= 1)
 {
@@ -484,12 +497,12 @@ constexpr auto TupleCat(Tuples&&... tuples)
                   });
 };
 
-export template <TupleLike... Tuples, typename F>
+UTEMPL_EXPORT template <TupleLike... Tuples, typename F>
 constexpr auto Unpack(Tuples&&... tuples, F&& f) -> decltype(Unpack(TupleCat(std::forward<Tuples>(tuples)...), std::forward<F>(f))) {
   return Unpack(TupleCat(std::forward<Tuples>(tuples)...), std::forward<F>(f));
 };
 
-export template <typename... Ts>
+UTEMPL_EXPORT template <typename... Ts>
 constexpr auto Tie(Ts&... args) -> Tuple<Ts&...> {
   return {args...};
 };
@@ -511,7 +524,7 @@ consteval auto PartialCallerF(TypeList<Ts...>) {
   };
 };
 
-export template <TupleLike Tuple, std::move_constructible T>
+UTEMPL_EXPORT template <TupleLike Tuple, std::move_constructible T>
 constexpr auto FirstOf(Tuple&& tuple, T&& init)
   requires kEveryElement<std::is_invocable, Tuple>
 {
@@ -523,7 +536,7 @@ constexpr auto FirstOf(Tuple&& tuple, T&& init)
   });
 };
 
-export template <typename T>
+UTEMPL_EXPORT template <typename T>
 constexpr auto FirstOf(T&& init) {
   return [init = std::forward<T>(init)]<TupleLike Tuple>(Tuple&& tuple) {
     return FirstOf(std::forward<Tuple>(tuple), std::move(init));
@@ -535,7 +548,7 @@ concept FilterConcept = decltype(Unpack(std::declval<Tuple>(), []<typename... Ts
   return kWrapper<(Function<F, bool(Ts)> && ...)>;
 }))::kValue;
 
-export template <TupleLike Tuple, FilterConcept<Tuple> F>
+UTEMPL_EXPORT template <TupleLike Tuple, FilterConcept<Tuple> F>
 constexpr auto Filter(Tuple&& tuple, F&& f) {
   return LeftFold(
       std::forward<Tuple>(tuple), MakeTuple<Tuple>(), [&]<TupleLike Accumulator, typename T>(Accumulator&& accumulator, T&& add) {
@@ -547,7 +560,7 @@ constexpr auto Filter(Tuple&& tuple, F&& f) {
       });
 };
 
-export template <typename F>
+UTEMPL_EXPORT template <typename F>
 constexpr auto Filter(F&& f) {
   return [f = std::forward<F>(f)]<TupleLike Tuple>(Tuple&& tuple)
     requires FilterConcept<F, Tuple>
@@ -556,7 +569,7 @@ constexpr auto Filter(F&& f) {
   };
 };
 
-export template <TupleLike Tuple, ForEachConcept<Tuple> F>
+UTEMPL_EXPORT template <TupleLike Tuple, ForEachConcept<Tuple> F>
 constexpr auto ForEach(Tuple&& tuple, F&& f) {
   Unpack(std::forward<Tuple>(tuple), [&]<typename... Ts>(Ts&&... args) {
     (f(std::forward<Ts>(args)), ...);
@@ -577,12 +590,12 @@ struct Curryer {
     return {.f = this->f, .data = this->data + Tuple{std::forward<T>(arg)}};
   };
 };
-export template <typename F>
+UTEMPL_EXPORT template <typename F>
 constexpr auto Curry(F&& f) -> Curryer<std::remove_cvref_t<F>> {
   return {.f = std::forward<F>(f), .data = Tuple{}};
 };
 
-export template <TupleLike Tuple, typename T>
+UTEMPL_EXPORT template <TupleLike Tuple, typename T>
 constexpr auto Find(Tuple&& tuple, T&& find) -> std::size_t {
   return Unpack(std::forward<Tuple>(tuple), [&]<typename... Ts>(Ts&&... args) {
     using Type = std::remove_cvref_t<T>;
@@ -606,7 +619,7 @@ constexpr auto Find(Tuple&& tuple, T&& find) -> std::size_t {
   });
 };
 
-export template <std::size_t N, TupleLike Tuple>
+UTEMPL_EXPORT template <std::size_t N, TupleLike Tuple>
 constexpr auto Take(Tuple&& tuple) {
   if constexpr(std::is_lvalue_reference_v<Tuple> && HasMakeTie<Tuple>) {
     return [&]<std::size_t... Is>(std::index_sequence<Is...>) {
@@ -619,21 +632,21 @@ constexpr auto Take(Tuple&& tuple) {
   };
 };
 
-export template <std::size_t N>
+UTEMPL_EXPORT template <std::size_t N>
 consteval auto Take() {
   return [&]<TupleLike Tuple>(Tuple&& tuple) {
     return Take<N>(std::forward<Tuple>(tuple));
   };
 };
 
-export template <TupleLike Tuple, std::move_constructible T>
+UTEMPL_EXPORT template <TupleLike Tuple, std::move_constructible T>
 constexpr auto operator<<(Tuple&& tuple, T&& t) {
   return Unpack(std::forward<Tuple>(tuple), [&]<typename... Ts>(Ts&&... args) {
     return MakeTuple<Tuple>(std::forward<Ts>(args)..., std::forward<T>(t));
   });
 };
 
-export template <std::size_t N, TupleLike Tuple = Tuple<>, typename T>
+UTEMPL_EXPORT template <std::size_t N, TupleLike Tuple = Tuple<>, typename T>
 constexpr auto Generate(T&& value)
   requires(std::copyable<T> || N == 1 && std::move_constructible<T>)
 {
@@ -646,7 +659,7 @@ constexpr auto Generate(T&& value)
   };
 };
 
-export template <TupleLike Tuple>
+UTEMPL_EXPORT template <TupleLike Tuple>
 constexpr auto Enumerate(Tuple&& tuple) {
   return Unpack(std::forward<Tuple>(tuple), [](auto&&... vs) {
     return [&](auto... is) {
@@ -665,12 +678,12 @@ concept CallableSwitchConcept = std::same_as<R, void> || decltype(Unpack(std::de
                                   return kWrapper<(Function<F, std::optional<R>(Ts)> && ...)>;
                                 }))::kValue;
 
-export template <typename R = void,
+UTEMPL_EXPORT template <typename R = void,
-                 TupleLike KeysTuple,
+                        TupleLike KeysTuple,
-                 TupleLike ValuesTuple,
+                        TupleLike ValuesTuple,
-                 ComparableSwitchConcept<KeysTuple> Key,
+                        ComparableSwitchConcept<KeysTuple> Key,
-                 CallableSwitchConcept<ValuesTuple, R> F,
+                        CallableSwitchConcept<ValuesTuple, R> F,
-                 Function<R()> Default = std::add_lvalue_reference_t<decltype(kDefaultCreator<R>)>>
+                        Function<R()> Default = std::add_lvalue_reference_t<decltype(kDefaultCreator<R>)>>
 constexpr auto Switch(KeysTuple&& keysTuple, ValuesTuple&& valuesTuple, Key&& key, F&& f, Default&& def = kDefaultCreator<R>) -> R
   requires(std::move_constructible<R> || std::same_as<R, void>) && (kTupleSize<KeysTuple> == kTupleSize<ValuesTuple>)
 {
@@ -702,14 +715,14 @@ constexpr auto Switch(KeysTuple&& keysTuple, ValuesTuple&& valuesTuple, Key&& ke
   });
 };
 
-export template <std::size_t N, typename R = Tuple<>>
+UTEMPL_EXPORT template <std::size_t N, typename R = Tuple<>>
 consteval auto GetIndexesTuple() {
   return [](auto... is) {
     return MakeTuple<R>(*is...);
   } | kSeq<N>;
 };
 
-export template <typename R = Tuple<>, typename... Ts>
+UTEMPL_EXPORT template <typename R = Tuple<>, typename... Ts>
 consteval auto GetTuple(TypeList<Ts...>, TypeList<R> = {}) {
   return MakeTuple<R>(kType<Ts>...);
 };

tests/go_interface.cpp

@@ -1,7 +1,6 @@
-module;
 #include <gtest/gtest.h>
-export module tests.go_interface;
+
-import utempl;
+#include <utempl/utempl.hpp>
 
 namespace utempl {
 

tests/overloaded.cpp

@@ -1,7 +1,6 @@
-module;
 #include <gtest/gtest.h>
-export module tests.overloaded;
+
-import utempl;
+#include <utempl/utempl.hpp>
 
 namespace utempl {