Add ABI tests

tests/abi/CMakeLists.txt

@@ -25,5 +25,6 @@ add_library(abi_compat_main STATIC main.cpp)
 target_link_libraries(abi_compat_main PUBLIC abi_compat_common)
 
 # add individual tests
+add_subdirectory(config)
 add_subdirectory(diag)
 add_subdirectory(inline_ns)

tests/abi/config/CMakeLists.txt

@@ -0,0 +1,22 @@
+# test the different options to change the namespace
+
+# test default namespace
+add_executable(abi_config_default default.cpp)
+target_link_libraries(abi_config_default PRIVATE abi_compat_main)
+add_test(
+    NAME test-abi_config_default
+    COMMAND abi_config_default ${DOCTEST_TEST_FILTER})
+
+# test no version namespace
+add_executable(abi_config_noversion noversion.cpp)
+target_link_libraries(abi_config_noversion PRIVATE abi_compat_main)
+add_test(
+    NAME test-abi_config_noversion
+    COMMAND abi_config_noversion ${DOCTEST_TEST_FILTER})
+
+# test custom namespace
+add_executable(abi_config_custom custom.cpp)
+target_link_libraries(abi_config_custom PRIVATE abi_compat_main)
+add_test(
+    NAME test-abi_config_custom
+    COMMAND abi_config_custom ${DOCTEST_TEST_FILTER})

tests/abi/config/config.hpp

@@ -0,0 +1,27 @@
+#pragma once
+
+#include "doctest.h"
+
+#include <iostream>
+#include <regex>
+#include <string>
+
+#define STRINGIZE_EX(x) #x
+#define STRINGIZE(x) STRINGIZE_EX(x)
+
+template<typename T>
+std::string namespace_name(std::string ns, T* /*unused*/ = nullptr) // NOLINT(performance-unnecessary-value-param)
+{
+#if DOCTEST_MSVC && !DOCTEST_CLANG
+    ns = __FUNCSIG__;
+#elif !DOCTEST_CLANG
+    ns = __PRETTY_FUNCTION__;
+#endif
+    std::smatch m;
+
+    // extract the true namespace name from the function signature
+    CAPTURE(ns);
+    CHECK(std::regex_search(ns, m, std::regex("nlohmann(::[a-zA-Z0-9_]+)*::basic_json")));
+
+    return m.str();
+}

tests/abi/config/custom.cpp

@@ -0,0 +1,25 @@
+#include "doctest_compatibility.h"
+
+#include "config.hpp"
+
+// define custom namespace
+#define NLOHMANN_JSON_NAMESPACE nlohmann // this line may be omitted
+#define NLOHMANN_JSON_NAMESPACE_BEGIN namespace nlohmann {
+#define NLOHMANN_JSON_NAMESPACE_END }
+#include <nlohmann/json_fwd.hpp>
+
+TEST_CASE("custom namespace")
+{
+    // GCC 4.8 fails with regex_error
+#if !DOCTEST_GCC || DOCTEST_GCC >= DOCTEST_COMPILER(4, 9, 0)
+    SECTION("namespace matches expectation")
+    {
+        std::string expected = "nlohmann::basic_json";
+
+        // fallback for Clang
+        std::string ns{STRINGIZE(NLOHMANN_JSON_NAMESPACE) "::basic_json"};
+
+        CHECK(namespace_name<nlohmann::json>(ns) == expected);
+    }
+#endif
+}

tests/abi/config/default.cpp

@@ -0,0 +1,33 @@
+#include "doctest_compatibility.h"
+
+#include "config.hpp"
+
+#include <nlohmann/json_fwd.hpp>
+
+TEST_CASE("default namespace")
+{
+    // GCC 4.8 fails with regex_error
+#if !DOCTEST_GCC || DOCTEST_GCC >= DOCTEST_COMPILER(4, 9, 0)
+    SECTION("namespace matches expectation")
+    {
+        std::string expected = "nlohmann::json_abi";
+
+#if JSON_DIAGNOSTICS
+        expected += "_diag";
+#endif
+
+#if JSON_USE_LEGACY_DISCARDED_VALUE_COMPARISON
+        expected += "_ldvcmp";
+#endif
+
+        expected += "_v" STRINGIZE(NLOHMANN_JSON_VERSION_MAJOR);
+        expected += "_" STRINGIZE(NLOHMANN_JSON_VERSION_MINOR);
+        expected += "_" STRINGIZE(NLOHMANN_JSON_VERSION_PATCH) "::basic_json";
+
+        // fallback for Clang
+        std::string ns{STRINGIZE(NLOHMANN_JSON_NAMESPACE) "::basic_json"};
+
+        CHECK(namespace_name<nlohmann::json>(ns) == expected);
+    }
+#endif
+}

tests/abi/config/noversion.cpp

@@ -0,0 +1,32 @@
+#include "doctest_compatibility.h"
+
+#include "config.hpp"
+
+#define NLOHMANN_JSON_NAMESPACE_NO_VERSION 1
+#include <nlohmann/json_fwd.hpp>
+
+TEST_CASE("default namespace without version component")
+{
+    // GCC 4.8 fails with regex_error
+#if !DOCTEST_GCC || DOCTEST_GCC >= DOCTEST_COMPILER(4, 9, 0)
+    SECTION("namespace matches expectation")
+    {
+        std::string expected = "nlohmann::json_abi";
+
+#if JSON_DIAGNOSTICS
+        expected += "_diag";
+#endif
+
+#if JSON_USE_LEGACY_DISCARDED_VALUE_COMPARISON
+        expected += "_ldvcmp";
+#endif
+
+        expected += "::basic_json";
+
+        // fallback for Clang
+        std::string ns{STRINGIZE(NLOHMANN_JSON_NAMESPACE) "::basic_json"};
+
+        CHECK(namespace_name<nlohmann::json>(ns) == expected);
+    }
+#endif
+}

tests/abi/include/nlohmann/json_v3_10_5.hpp

@@ -36,8 +36,8 @@ SOFTWARE.
  * file doc/README.md.                                                      *
 \****************************************************************************/
 
-#ifndef INCLUDE_NLOHMANN_JSON_HPP_
-#define INCLUDE_NLOHMANN_JSON_HPP_
+#ifndef INCLUDE_NLOHMANN_JSON_V3_10_5_HPP_
+#define INCLUDE_NLOHMANN_JSON_V3_10_5_HPP_
 
 #define NLOHMANN_JSON_VERSION_MAJOR 3
 #define NLOHMANN_JSON_VERSION_MINOR 10
@@ -22088,4 +22088,4 @@ inline nlohmann::json::json_pointer operator "" _json_pointer(const char* s, std
 
 
 
-#endif  // INCLUDE_NLOHMANN_JSON_HPP_
+#endif  // INCLUDE_NLOHMANN_JSON_V3_10_5_HPP_