Make sure that the headers are self-contained; fixes #528

.github/workflows/linux.yaml

@@ -10,7 +10,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        format: ["JSON", "AVRO", "CAPNPROTO", "CBOR", "FLEXBUFFERS", "MSGPACK", "PARQUET", "TOML", "UBJSON", "XML", "YAML", "benchmarks"]
+        format: ["JSON", "AVRO", "CAPNPROTO", "CBOR", "FLEXBUFFERS", "MSGPACK", "PARQUET", "TOML", "UBJSON", "XML", "YAML", "benchmarks", "headers"]
         compiler: [llvm, gcc]
         compiler-version: [11, 12, 13, 14, 16, 17, 18]
         cxx: [20, 23]
@@ -82,12 +82,14 @@ jobs:
             cmake -S . -B build -G Ninja -DCMAKE_CXX_STANDARD=${{ matrix.cxx }} -DCMAKE_CXX_STANDARD=20 -DREFLECTCPP_BUILD_TESTS=ON -DCMAKE_BUILD_TYPE=Release
           elif [[ "${{ matrix.format }}" == "benchmarks" ]]; then
             cmake -S . -B build -G Ninja -DCMAKE_CXX_STANDARD=${{ matrix.cxx }} -DCMAKE_CXX_STANDARD=20 -DREFLECTCPP_BUILD_BENCHMARKS=ON -DREFLECTCPP_ALL_FORMATS=ON -DCMAKE_BUILD_TYPE=Release
+          elif [[ "${{ matrix.format }}" == "headers" ]]; then
+            cmake -S . -B build -G Ninja -DCMAKE_CXX_STANDARD=${{ matrix.cxx }} -DCMAKE_CXX_STANDARD=20 -DREFLECTCPP_CHECK_HEADERS=ON -DCMAKE_BUILD_TYPE=Release
           else
             cmake -S . -B build -G Ninja -DCMAKE_CXX_STANDARD=${{ matrix.cxx }} -DCMAKE_CXX_STANDARD=20 -DREFLECTCPP_BUILD_TESTS=ON -DREFLECTCPP_JSON=OFF -DREFLECTCPP_${{ matrix.format }}=ON -DCMAKE_BUILD_TYPE=Release
           fi
           cmake --build build -j4
       - name: Run tests
-        if: matrix.format != 'benchmarks'  
+        if: (matrix.format != 'benchmarks') && (matrix.format != 'headers')
         run: |
           ctest --test-dir build --output-on-failure
       - name: Run benchmarks 

.github/workflows/macos.yaml

@@ -11,7 +11,7 @@ jobs:
       fail-fast: false
       matrix:
         os: ["macos-latest", "macos-13"]
-        format: ["JSON", "AVRO", "CAPNPROTO", "CBOR", "FLEXBUFFERS", "MSGPACK", "PARQUET", "TOML", "UBJSON", "XML", "YAML", "benchmarks"]
+        format: ["tests", "benchmarks"]
     name: "${{ matrix.os }} (${{ matrix.format }})"
     runs-on: ${{ matrix.os }}
     steps:
@@ -43,12 +43,10 @@ jobs:
             export CMAKE_GENERATOR=Ninja
           fi
           $CXX --version
-          if [[ "${{ matrix.format }}" == "JSON" ]]; then
-            cmake -S . -B build -DCMAKE_CXX_STANDARD=20 -DREFLECTCPP_BUILD_TESTS=ON -DCMAKE_BUILD_TYPE=Release -DCMAKE_C_COMPILER=clang -DCMAKE_CXX_COMPILER=clang++
-          elif [[ "${{ matrix.format }}" == "benchmarks" ]]; then
+          if [[ "${{ matrix.format }}" == "benchmarks" ]]; then
             cmake -S . -B build -G Ninja -DCMAKE_CXX_STANDARD=${{ matrix.cxx }} -DCMAKE_CXX_STANDARD=20 -DREFLECTCPP_BUILD_BENCHMARKS=ON -DREFLECTCPP_ALL_FORMATS=ON -DCMAKE_BUILD_TYPE=Release -DCMAKE_C_COMPILER=clang -DCMAKE_CXX_COMPILER=clang++
           else
-            cmake -S . -B build -DCMAKE_CXX_STANDARD=20 -DREFLECTCPP_BUILD_TESTS=ON -DREFLECTCPP_JSON=OFF -DREFLECTCPP_${{ matrix.format }}=ON -DCMAKE_BUILD_TYPE=Release -DCMAKE_C_COMPILER=clang -DCMAKE_CXX_COMPILER=clang++
+            cmake -S . -B build -DCMAKE_CXX_STANDARD=20 -DREFLECTCPP_BUILD_TESTS=ON -DREFLECTCPP_ALL_FORMATS=ON -DREFLECTCPP_CHECK_HEADERS=ON -DCMAKE_BUILD_TYPE=Release -DCMAKE_C_COMPILER=clang -DCMAKE_CXX_COMPILER=clang++
           fi
           cmake --build build -j 4
       - name: Run tests

.github/workflows/windows.yaml

@@ -32,17 +32,23 @@ jobs:
         run: |
           cmake -S . -B build -G Ninja -DCMAKE_CXX_STANDARD=${{ matrix.cxx }} -DCMAKE_CXX_STANDARD=20 -DREFLECTCPP_BUILD_BENCHMARKS=ON -DREFLECTCPP_ALL_FORMATS=ON -DCMAKE_BUILD_TYPE=Release
           cmake --build build --config Release -j4 
+      - name: Check headers 
+        if: matrix.format == 'headers'
+        run: |
+          cmake -S . -B build -DCMAKE_CXX_STANDARD=20 -DREFLECTCPP_CHECK_HEADERS=ON -DCMAKE_BUILD_TYPE=Release
+          cmake --build build --config Release -j4 
       - name: Compile tests (JSON)
         if: matrix.format == 'JSON'
         run: |
           cmake -S . -B build -DCMAKE_CXX_STANDARD=20 -DREFLECTCPP_BUILD_TESTS=ON -DCMAKE_BUILD_TYPE=Release
           cmake --build build --config Release -j4 
       - name: Compile tests (Other formats)
-        if: matrix.format != 'JSON' && matrix.format != 'benchmarks'
+        if: matrix.format != 'JSON' && matrix.format != 'benchmarks' && matrix.format != 'headers'
         run: |
           cmake -S . -B build -DCMAKE_CXX_STANDARD=20 -DREFLECTCPP_BUILD_TESTS=ON -DREFLECTCPP_JSON=OFF -DREFLECTCPP_${{ matrix.format }}=ON -DCMAKE_BUILD_TYPE=Release
           cmake --build build --config Release -j4 
       - name: Run tests
+        if: matrix.format != 'benchmarks' 
         run: |
           ctest --test-dir build --output-on-failure
       - name: Run benchmarks 
@@ -99,4 +105,4 @@ jobs:
         run: |
           ctest --test-dir build --output-on-failure
 
-
+

CMakeLists.txt

@@ -22,6 +22,7 @@ option(REFLECTCPP_YAML "Enable YAML support" ${REFLECTCPP_ALL_FORMATS})
 
 option(REFLECTCPP_BUILD_BENCHMARKS "Build benchmarks" OFF)
 option(REFLECTCPP_BUILD_TESTS "Build tests" OFF)
+option(REFLECTCPP_CHECK_HEADERS "Make sure that all headers are self-contained" OFF)
 
 option(REFLECTCPP_USE_BUNDLED_DEPENDENCIES "Use the bundled dependencies" ON)
 
@@ -55,7 +56,7 @@ if(REFLECTCPP_BUILD_BENCHMARKS)
     set(REFLECTCPP_YAML ON CACHE BOOL "" FORCE)
 endif()
 
-if (REFLECTCPP_BUILD_TESTS OR REFLECTCPP_BUILD_BENCHMARKS OR
+if (REFLECTCPP_BUILD_TESTS OR REFLECTCPP_BUILD_BENCHMARKS OR REFLECTCPP_CHECK_HEADERS OR
     (REFLECTCPP_JSON AND NOT REFLECTCPP_USE_BUNDLED_DEPENDENCIES) OR REFLECTCPP_AVRO OR
     REFLECTCPP_BSON OR REFLECTCPP_CAPNPROTO OR REFLECTCPP_CBOR OR REFLECTCPP_CSV OR
     REFLECTCPP_FLEXBUFFERS OR REFLECTCPP_MSGPACK OR REFLECTCPP_PARQUET OR REFLECTCPP_XML OR 
@@ -73,67 +74,67 @@ endif()
 option(REFLECTCPP_USE_VCPKG "Use VCPKG to download and build dependencies" ${REFLECTCPP_USE_VCPKG_DEFAULT})
 
 if (REFLECTCPP_USE_VCPKG)
-    if (REFLECTCPP_AVRO)
+    if (REFLECTCPP_AVRO OR REFLECTCPP_CHECK_HEADERS)
         list(APPEND VCPKG_MANIFEST_FEATURES "avro")
     endif()
 
-    if (REFLECTCPP_BSON)
+    if (REFLECTCPP_BSON OR REFLECTCPP_CHECK_HEADERS)
         list(APPEND VCPKG_MANIFEST_FEATURES "bson")
     endif()
 
-    if (REFLECTCPP_BUILD_BENCHMARKS)
+    if (REFLECTCPP_BUILD_BENCHMARKS OR REFLECTCPP_CHECK_HEADERS)
         list(APPEND VCPKG_MANIFEST_FEATURES "benchmarks")
     endif()
 
-    if (REFLECTCPP_BUILD_TESTS)
+    if (REFLECTCPP_BUILD_TESTS OR REFLECTCPP_CHECK_HEADERS)
         list(APPEND VCPKG_MANIFEST_FEATURES "tests")
     endif()
 
-    if (REFLECTCPP_CAPNPROTO)
+    if (REFLECTCPP_CAPNPROTO OR REFLECTCPP_CHECK_HEADERS)
         list(APPEND VCPKG_MANIFEST_FEATURES "capnproto")
     endif()
 
-    if (REFLECTCPP_CBOR)
+    if (REFLECTCPP_CBOR OR REFLECTCPP_CHECK_HEADERS)
         list(APPEND VCPKG_MANIFEST_FEATURES "cbor")
     endif()
 
-    if (REFLECTCPP_CSV)
+    if (REFLECTCPP_CSV OR REFLECTCPP_CHECK_HEADERS)
         list(APPEND VCPKG_MANIFEST_FEATURES "csv")
     endif()
 
     if (NOT REFLECTCPP_USE_BUNDLED_DEPENDENCIES)
         list(APPEND VCPKG_MANIFEST_FEATURES "ctre")
     endif()
 
-    if (REFLECTCPP_FLEXBUFFERS)
+    if (REFLECTCPP_FLEXBUFFERS OR REFLECTCPP_CHECK_HEADERS)
         list(APPEND VCPKG_MANIFEST_FEATURES "flexbuffers")
     endif()
 
     if (_REFLECTCPP_NEEDS_JSON_IMPL AND NOT REFLECTCPP_USE_BUNDLED_DEPENDENCIES)
         list(APPEND VCPKG_MANIFEST_FEATURES "json")
     endif()
 
-    if (REFLECTCPP_MSGPACK)
+    if (REFLECTCPP_MSGPACK OR REFLECTCPP_CHECK_HEADERS)
         list(APPEND VCPKG_MANIFEST_FEATURES "msgpack")
     endif()
 
-    if (REFLECTCPP_PARQUET)
+    if (REFLECTCPP_PARQUET OR REFLECTCPP_CHECK_HEADERS)
         list(APPEND VCPKG_MANIFEST_FEATURES "parquet")
     endif()
 
-    if (REFLECTCPP_TOML)
+    if (REFLECTCPP_TOML OR REFLECTCPP_CHECK_HEADERS)
         list(APPEND VCPKG_MANIFEST_FEATURES "toml")
     endif()
 
-    if (REFLECTCPP_UBJSON)
+    if (REFLECTCPP_UBJSON OR REFLECTCPP_CHECK_HEADERS)
         list(APPEND VCPKG_MANIFEST_FEATURES "ubjson")
     endif()
 
-    if (REFLECTCPP_XML)
+    if (REFLECTCPP_XML OR REFLECTCPP_CHECK_HEADERS)
         list(APPEND VCPKG_MANIFEST_FEATURES "xml")
     endif()
 
-    if (REFLECTCPP_YAML)
+    if (REFLECTCPP_YAML OR REFLECTCPP_CHECK_HEADERS)
         list(APPEND VCPKG_MANIFEST_FEATURES "yaml")
     endif()
 
@@ -237,7 +238,7 @@ if (_REFLECTCPP_NEEDS_JSON_IMPL)
     endif ()
 endif ()
 
-if (REFLECTCPP_AVRO)
+if (REFLECTCPP_AVRO OR REFLECTCPP_CHECK_HEADERS)
     list(APPEND REFLECT_CPP_SOURCES
         src/reflectcpp_avro.cpp
     )
@@ -270,7 +271,7 @@ if (REFLECTCPP_AVRO)
     target_link_libraries(reflectcpp PRIVATE jansson::jansson)
 endif ()
 
-if (REFLECTCPP_BSON)
+if (REFLECTCPP_BSON OR REFLECTCPP_CHECK_HEADERS)
     list(APPEND REFLECT_CPP_SOURCES
         src/reflectcpp_bson.cpp
     )
@@ -280,7 +281,7 @@ if (REFLECTCPP_BSON)
     target_link_libraries(reflectcpp PUBLIC $<IF:$<TARGET_EXISTS:mongo::bson_static>,mongo::bson_static,mongo::bson_shared>)
 endif ()
 
-if (REFLECTCPP_CAPNPROTO)
+if (REFLECTCPP_CAPNPROTO OR REFLECTCPP_CHECK_HEADERS)
     list(APPEND REFLECT_CPP_SOURCES
         src/reflectcpp_capnproto.cpp
     )
@@ -295,7 +296,7 @@ if (REFLECTCPP_CAPNPROTO)
     target_link_libraries(reflectcpp PUBLIC CapnProto::kj CapnProto::capnp ${CAPNPC_LIB} CapnProto::kj-gzip)
 endif ()
 
-if (REFLECTCPP_CBOR)
+if (REFLECTCPP_CBOR OR REFLECTCPP_CHECK_HEADERS)
     list(APPEND REFLECT_CPP_SOURCES
         src/reflectcpp_cbor.cpp
     )
@@ -305,7 +306,7 @@ if (REFLECTCPP_CBOR)
     include_directories(PUBLIC ${jsoncons_INCLUDE_DIRS})
 endif ()
 
-if (REFLECTCPP_CSV)
+if (REFLECTCPP_CSV OR REFLECTCPP_CHECK_HEADERS)
     if (NOT TARGET Arrow)
         find_package(Arrow CONFIG REQUIRED)
     endif()
@@ -316,7 +317,7 @@ if (REFLECTCPP_CSV)
     endif()
 endif ()
 
-if (REFLECTCPP_FLEXBUFFERS)
+if (REFLECTCPP_FLEXBUFFERS OR REFLECTCPP_CHECK_HEADERS)
     list(APPEND REFLECT_CPP_SOURCES
         src/reflectcpp_flexbuf.cpp
     )
@@ -326,7 +327,7 @@ if (REFLECTCPP_FLEXBUFFERS)
     target_link_libraries(reflectcpp PUBLIC flatbuffers::flatbuffers)
 endif ()
 
-if (REFLECTCPP_MSGPACK)
+if (REFLECTCPP_MSGPACK OR REFLECTCPP_CHECK_HEADERS)
     list(APPEND REFLECT_CPP_SOURCES
         src/reflectcpp_msgpack.cpp
     )
@@ -336,7 +337,7 @@ if (REFLECTCPP_MSGPACK)
     target_link_libraries(reflectcpp PUBLIC msgpack-c)
 endif ()
 
-if (REFLECTCPP_PARQUET)
+if (REFLECTCPP_PARQUET OR REFLECTCPP_CHECK_HEADERS)
     if (NOT TARGET Arrow)
         find_package(Arrow CONFIG REQUIRED)
     endif()
@@ -351,7 +352,7 @@ if (REFLECTCPP_PARQUET)
     endif()
 endif ()
 
-if (REFLECTCPP_TOML)
+if (REFLECTCPP_TOML OR REFLECTCPP_CHECK_HEADERS)
     list(APPEND REFLECT_CPP_SOURCES
         src/reflectcpp_toml.cpp
     )
@@ -361,7 +362,7 @@ if (REFLECTCPP_TOML)
     target_link_libraries(reflectcpp PUBLIC tomlplusplus::tomlplusplus)
 endif()
 
-if (REFLECTCPP_UBJSON)
+if (REFLECTCPP_UBJSON OR REFLECTCPP_CHECK_HEADERS)
     list(APPEND REFLECT_CPP_SOURCES
         src/reflectcpp_ubjson.cpp
     )
@@ -371,7 +372,7 @@ if (REFLECTCPP_UBJSON)
     include_directories(PUBLIC ${jsoncons_INCLUDE_DIRS})
 endif ()
 
-if (REFLECTCPP_XML)
+if (REFLECTCPP_XML OR REFLECTCPP_CHECK_HEADERS)
     list(APPEND REFLECT_CPP_SOURCES
         src/reflectcpp_xml.cpp
     )
@@ -381,7 +382,7 @@ if (REFLECTCPP_XML)
     target_link_libraries(reflectcpp PUBLIC pugixml::pugixml)
 endif ()
 
-if (REFLECTCPP_YAML)
+if (REFLECTCPP_YAML OR REFLECTCPP_CHECK_HEADERS)
     list(APPEND REFLECT_CPP_SOURCES
         src/reflectcpp_yaml.cpp
     )
@@ -415,6 +416,34 @@ if (REFLECTCPP_BUILD_BENCHMARKS)
     add_subdirectory(benchmarks)
 endif ()
 
+if(REFLECTCPP_CHECK_HEADERS)
+    file(GLOB_RECURSE PROJECT_HEADERS "include/*.hpp")
+
+    set(TEST_DIR "${CMAKE_CURRENT_BINARY_DIR}/self_contained_tests")
+    file(MAKE_DIRECTORY "${TEST_DIR}")
+
+    foreach(HEADER_FILE ${PROJECT_HEADERS})
+        if(NOT HEADER_FILE MATCHES "thirdparty")
+            string(MAKE_C_IDENTIFIER ${HEADER_FILE} HEADER_NAME)
+            set(TEST_SOURCE_FILE "${TEST_DIR}/test_${HEADER_NAME}.cpp")
+
+            file(GENERATE
+                OUTPUT ${TEST_SOURCE_FILE}
+                CONTENT "#include \"${HEADER_FILE}\"\n"
+            )
+
+            add_library(check_header_${HEADER_NAME} "${TEST_SOURCE_FILE}")
+
+            target_include_directories(check_header_${HEADER_NAME} PRIVATE
+                ${CMAKE_CURRENT_SOURCE_DIR}
+                ${ADDITIONAL_INCLUDE_DIRS}
+            )
+
+            add_custom_target(check_${HEADER_NAME} ALL DEPENDS check_header_${HEADER_NAME})
+        endif()
+    endforeach()
+endif()
+
 if (REFLECTCPP_INSTALL)
     include(GNUInstallDirs)
     include(CMakePackageConfigHelpers)
@@ -451,9 +480,6 @@ if (REFLECTCPP_INSTALL)
     )
 endif ()
 
-
-# CPack configuration
-
 # Set general package information
 set(CPACK_PACKAGE_NAME "reflectcpp")
 set(CPACK_PACKAGE_VENDOR "Reflect C++ Team")

include/rfl/Processors.hpp

@@ -2,6 +2,7 @@
 #define RFL_INTERNAL_PROCESSORS_HPP_
 
 #include <type_traits>
+#include <utility>
 
 #include "internal/is_add_tags_to_variants_v.hpp"
 #include "internal/is_allow_raw_ptrs_v.hpp"
@@ -69,9 +70,9 @@ struct Processors<Head, Tail...> {
 
   template <class T, class NamedTupleType>
   static auto process(NamedTupleType&& _named_tuple) {
-    static_assert(!add_tags_to_variants_ || !add_namespaced_tags_to_variants_,  
-                  "You cannot add both rfl::AddTagsToVariants and "  
-                  "rfl::AddNamespacedTagsToVariants.");  
+    static_assert(!add_tags_to_variants_ || !add_namespaced_tags_to_variants_,
+                  "You cannot add both rfl::AddTagsToVariants and "
+                  "rfl::AddNamespacedTagsToVariants.");
     return Processors<Tail...>::template process<T>(
         Head::template process<T>(std::move(_named_tuple)));
   }

include/rfl/Timestamp.hpp

@@ -7,6 +7,7 @@
 #include <stdexcept>
 #include <string>
 
+#include "Literal.hpp"
 #include "Result.hpp"
 #include "internal/StringLiteral.hpp"
 

include/rfl/Tuple.hpp

@@ -2,6 +2,7 @@
 #define RFL_TUPLE_HPP_
 
 #include <array>
+#include <cstddef>
 #include <tuple>
 #include <type_traits>
 #include <utility>
@@ -43,9 +44,7 @@ class Tuple {
 
   Tuple(const Tuple& _other) { copy_from_other(_other, seq_); }
 
-  Tuple(Tuple&& _other) noexcept {
-    move_from_other(std::move(_other), seq_);
-  }
+  Tuple(Tuple&& _other) noexcept { move_from_other(std::move(_other), seq_); }
 
   ~Tuple() { destroy_if_necessary(seq_); }
 
@@ -154,8 +153,7 @@ class Tuple {
   }
 
   template <int... _is>
-  void move_from_other(Tuple&& _other,
-                       std::integer_sequence<int, _is...>) {
+  void move_from_other(Tuple&& _other, std::integer_sequence<int, _is...>) {
     const auto move_one = [this]<int _i>(auto&& _other,
                                          std::integral_constant<int, _i>) {
       using Type = internal::nth_element_t<_i, Types...>;