Option to disable C++20 concepts code

CMakeLists.txt

@@ -36,6 +36,7 @@ option(HIGHFIVE_PARALLEL_HDF5 "Enable Parallel HDF5 support" OFF)
 option(HIGHFIVE_BUILD_DOCS "Enable documentation building" ON)
 option(HIGHFIVE_VERBOSE "Set logging level to verbose." OFF)
 option(HIGHFIVE_GLIBCXX_ASSERTIONS "Enable bounds check for STL." OFF)
+option(HIGHFIVE_HAS_CONCEPTS "Print readable compiler errors w/ C++20 concepts" ON)
 
 # Controls if HighFive classes are friends of each other.
 #
@@ -92,6 +93,10 @@ endif()
 
 add_compile_definitions(HIGHFIVE_CXX_STD=${CMAKE_CXX_STANDARD})
 
+if(HIGHFIVE_USE_CONCEPTS AND CMAKE_CXX_STANDARD GREATER_EQUAL 20)
+  add_compile_definitions(HIGHFIVE_HAS_CONCEPTS)
+endif()
+
 # Search dependencies (hdf5, boost, eigen, xtensor, mpi) and build target highfive_deps
 include(${PROJECT_SOURCE_DIR}/CMake/HighFiveTargetDeps.cmake)
 

include/highfive/H5PropertyList.hpp

@@ -142,7 +142,7 @@ class PropertyListBase: public Object {
 /// \sa Instructions to document C++20 concepts with Doxygen: https://github.com/doxygen/doxygen/issues/2732#issuecomment-509629967
 ///
 /// \cond
-#if __cplusplus >= 202002L
+#if HIGHFIVE_HAS_CONCEPTS && __cplusplus >= 202002L
 template <typename P>
 concept PropertyInterface = requires(P p, const hid_t hid) {
     {p.apply(hid)};