Add Tuple Example

CMakeLists.txt

@@ -18,4 +18,15 @@ if(ENABLE_TESTS)
   include(GoogleTest)
   gtest_discover_tests(utempl_tests)
 endif()
+if(ENABLE_EXAMPLES)
+  file(GLOB EXAMPLES_SRC "examples/src/*.cpp")
+  foreach(EXAMPLE_SRC ${EXAMPLES_SRC})
+      get_filename_component(EXAMPLE_NAME ${EXAMPLE_SRC} NAME_WE)
+      add_executable(${EXAMPLE_NAME} ${EXAMPLE_SRC})
+      target_link_libraries(${EXAMPLE_NAME} utempl)
+      set_property(TARGET ${EXAMPLE_NAME} PROPERTY CXX_STANDARD 20)
+      set_target_properties(${EXAMPLE_NAME} PROPERTIES
+          RUNTIME_OUTPUT_DIRECTORY "${CMAKE_SOURCE_DIR}/examples/")
+endforeach()
+endif()
 target_include_directories(utempl INTERFACE include)

examples/src/tuple.cpp

@@ -0,0 +1,23 @@
+#include <utempl/tuple.hpp>
+#include <utempl/utils.hpp>
+#include <iostream>
+#include <cassert>
+
+auto main() -> int {
+  using utempl::literals::operator""_c;
+  constexpr utempl::Tuple tuple = utempl::Tuple{42, 3.141500, "Hello World"};
+  utempl::Tuple<int> tuple2{{}}; 
+  std::ignore = tuple2;
+  std::cout << utempl::kTupleSize<decltype(tuple)> << std::endl; // Get tuple size
+  std::cout << tuple[0_c] << std::endl; // Get element using [] with literal
+  auto newTuple = utempl::Transform(tuple, utempl::Overloaded(
+    [](auto arg){
+      return std::to_string(arg);
+    },
+    [](const char* arg) {
+      return std::string(arg);
+    }
+  ));
+  auto flag = newTuple == utempl::Tuple<std::string, std::string, std::string>{"42", "3.141500", "Hello World"};
+  assert(flag);
+};