Add CPM support

CMakeLists.txt

@@ -2,11 +2,35 @@ cmake_minimum_required(VERSION 3.27)
 project(utempl
   VERSION 0.1)
 set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
-find_package(fmt REQUIRED)
-find_package(Boost 1.84.0 REQUIRED)
 set(CMAKE_CXX_STANDART 20)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 set(CXX_EXTENSIONS NO)
+set(BOOST_INCLUDE_LIBRARIES "pfr")
+option(CPM_USE_LOCAL_PACKAGES "Use local packages" ON)
+
+
+file(
+  DOWNLOAD
+  https://github.com/cpm-cmake/CPM.cmake/releases/download/v0.40.0/CPM.cmake
+  ${CMAKE_CURRENT_BINARY_DIR}/cmake/CPM.cmake
+  EXPECTED_HASH
+  SHA256=7b354f3a5976c4626c876850c93944e52c83ec59a159ae5de5be7983f0e17a2a
+)
+include(${CMAKE_CURRENT_BINARY_DIR}/cmake/CPM.cmake)
+
+CPMAddPackage(
+  NAME Boost
+  VERSION 1.85.0
+  URL "https://github.com/boostorg/boost/releases/download/boost-1.85.0/boost-1.85.0-cmake.tar.xz"  
+  EXCLUDE_FROM_ALL ON
+  OPTIONS "BOOST_SKIP_INSTALL_RULES OFF"
+)
+
+CPMAddPackage("gh:fmtlib/fmt#10.2.1")
+
+
+
+
 
 cmake_policy(SET CMP0079 NEW)
 
@@ -16,8 +40,13 @@ target_include_directories(
   utempl
   INTERFACE $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include>
             $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>)
-target_link_libraries(utempl INTERFACE fmt::fmt-header-only ${Boost_LIBRARIES})
 
+if(TARGET Boost::pfr)
+  target_link_libraries(utempl INTERFACE fmt::fmt-header-only Boost::pfr)
+else()
+  find_package(Boost 1.85.0 REQUIRED)
+  target_link_libraries(utempl INTERFACE fmt::fmt-header-only ${Boost_LIBRARIES})
+endif()
 target_compile_features(utempl INTERFACE cxx_std_20)
 
 install(TARGETS utempl