Add generated version info

CMakeLists.txt

@@ -19,6 +19,12 @@ project(nlohmann_json_schema_validator
 
 message(STATUS "Version: ${PROJECT_VERSION}")
 
+set(LIB_VERSION_CPP_FILE ${CMAKE_CURRENT_BINARY_DIR}/json-schema-version.cpp)
+set(LIB_VERSION_HPP_FILE ${CMAKE_CURRENT_BINARY_DIR}/include/nlohmann/json-schema-version.hpp)
+
+configure_file(src/json-schema-version.cpp.in ${LIB_VERSION_CPP_FILE})
+configure_file(src/json-schema-version.hpp.in ${LIB_VERSION_HPP_FILE})
+
 cmake_minimum_required(VERSION 3.2)
 
 option(BUILD_TESTS    "Build tests"    ON)
@@ -35,12 +41,14 @@ add_library(nlohmann_json_schema_validator
     src/json-uri.cpp
     src/json-validator.cpp
     src/json-patch.cpp
+    ${LIB_VERSION_CPP_FILE}
     src/string-format-check.cpp)
 
 target_include_directories(nlohmann_json_schema_validator
     PUBLIC
         $<INSTALL_INTERFACE:include>
-        $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/src>)
+        $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/src>
+        $<BUILD_INTERFACE:${CMAKE_CURRENT_BINARY_DIR}/include>)
 
 target_compile_features(nlohmann_json_schema_validator
     PUBLIC

src/json-schema-version.cpp.in

@@ -0,0 +1,44 @@
+#include <nlohmann/json-schema-version.hpp>
+
+namespace nlohmann
+{
+namespace json_schema
+{
+namespace about
+{
+
+const std::string &version_txt()
+{
+	// clang-format off
+	static std::string version{"${${PROJECT_NAME}_VERSION}"};
+	// clang-format on
+	return version;
+}
+
+// clang-format off
+template <>
+bool check_library_version<${${PROJECT_NAME}_VERSION_MAJOR}>() noexcept
+{
+	return true;
+}
+// clang-format on
+
+// clang-format off
+template <>
+bool check_library_version<${${PROJECT_NAME}_VERSION_MAJOR}, ${${PROJECT_NAME}_VERSION_MINOR}>() noexcept
+{
+	return true;
+}
+// clang-format on
+
+// clang-format off
+template <>
+bool check_library_version<${${PROJECT_NAME}_VERSION_MAJOR}, ${${PROJECT_NAME}_VERSION_MINOR}, ${${PROJECT_NAME}_VERSION_PATCH}>() noexcept
+{
+	return true;
+}
+// clang-format on
+
+} // namespace about
+} // namespace json_schema
+} // namespace nlohmann

src/json-schema-version.hpp.in

@@ -0,0 +1,43 @@
+#ifndef NLOHMANN_JSON_SCHEMA_VERSION_HPP__
+#define NLOHMANN_JSON_SCHEMA_VERSION_HPP__
+
+#include <nlohmann/json-schema-decl.hpp>
+#include <string>
+
+namespace nlohmann
+{
+namespace json_schema
+{
+namespace about
+{
+// clang-format off
+constexpr int VERSION_MAJOR=${${PROJECT_NAME}_VERSION_MAJOR};
+constexpr int VERSION_MINOR=${${PROJECT_NAME}_VERSION_MINOR};
+constexpr int VERSION_PATCH=${${PROJECT_NAME}_VERSION_PATCH};
+constexpr int VERSION_ID=((VERSION_MAJOR*10000) + (VERSION_MINOR*100) + (VERSION_PATCH));
+// clang-format on
+
+// Get library version as string
+JSON_SCHEMA_VALIDATOR_API const std::string &
+version_txt();
+
+// Linker level library version check
+// Check for library major version only
+template <int>
+JSON_SCHEMA_VALIDATOR_API bool check_library_version() noexcept;
+
+// Linker level library version check
+// Check for library major/minor version
+template <int, int>
+JSON_SCHEMA_VALIDATOR_API bool check_library_version() noexcept;
+
+// Linker level library version check
+// Check for library major/minor/patch version
+template <int, int, int>
+JSON_SCHEMA_VALIDATOR_API bool check_library_version() noexcept;
+
+} // namespace about
+} // namespace json_schema
+} // namespace nlohmann
+
+#endif

src/nlohmann/json-schema-decl.hpp

@@ -0,0 +1,16 @@
+#ifndef NLOHMANN_JSON_SCHEMA_DECL_HPP__
+#define NLOHMANN_JSON_SCHEMA_DECL_HPP__
+
+#ifdef _WIN32
+#	if defined(JSON_SCHEMA_VALIDATOR_EXPORTS)
+#		define JSON_SCHEMA_VALIDATOR_API __declspec(dllexport)
+#	elif defined(JSON_SCHEMA_VALIDATOR_IMPORTS)
+#		define JSON_SCHEMA_VALIDATOR_API __declspec(dllimport)
+#	else
+#		define JSON_SCHEMA_VALIDATOR_API
+#	endif
+#else
+#	define JSON_SCHEMA_VALIDATOR_API
+#endif
+
+#endif

src/nlohmann/json-schema.hpp

@@ -9,17 +9,7 @@
 #ifndef NLOHMANN_JSON_SCHEMA_HPP__
 #define NLOHMANN_JSON_SCHEMA_HPP__
 
-#ifdef _WIN32
-#	if defined(JSON_SCHEMA_VALIDATOR_EXPORTS)
-#		define JSON_SCHEMA_VALIDATOR_API __declspec(dllexport)
-#	elif defined(JSON_SCHEMA_VALIDATOR_IMPORTS)
-#		define JSON_SCHEMA_VALIDATOR_API __declspec(dllimport)
-#	else
-#		define JSON_SCHEMA_VALIDATOR_API
-#	endif
-#else
-#	define JSON_SCHEMA_VALIDATOR_API
-#endif
+#include "json-schema-decl.hpp"
 
 #include <nlohmann/json.hpp>