[C++] Add unit test for native_type usage

CMakeLists.txt

@@ -117,10 +117,15 @@ set(FlatBuffers_Tests_SRCS
   tests/test_assert.cpp
   tests/test_builder.h
   tests/test_builder.cpp
+  tests/vector3d.h
+  tests/vector3d_pack.h
+  tests/vector3d_pack.cpp
   # file generate by running compiler on tests/monster_test.fbs
   ${CMAKE_CURRENT_BINARY_DIR}/tests/monster_test_generated.h
   # file generate by running compiler on tests/arrays_test.fbs
   ${CMAKE_CURRENT_BINARY_DIR}/tests/arrays_test_generated.h
+  # file generate by running compiler on tests/native_type_test.fbs
+  ${CMAKE_CURRENT_BINARY_DIR}/tests/native_type_test_generated.h
 )
 
 set(FlatBuffers_Sample_Binary_SRCS

tests/generate_code.bat

@@ -22,6 +22,7 @@ if "%1"=="-b" set buildtype=%2
 ..\%buildtype%\flatc.exe -b --schema --bfbs-comments --bfbs-builtins -I include_test arrays_test.fbs || goto FAIL
 ..\%buildtype%\flatc.exe --jsonschema --schema -I include_test monster_test.fbs || goto FAIL
 ..\%buildtype%\flatc.exe --cpp --java --csharp --python --gen-mutable --reflect-names --gen-object-api --gen-compare --no-includes --scoped-enums --jsonschema --cpp-ptr-type flatbuffers::unique_ptr arrays_test.fbs || goto FAIL
+..\%buildtype%\flatc.exe --cpp --gen-mutable --gen-object-api native_type_test.fbs || goto FAIL
 
 IF NOT "%MONSTER_EXTRA%"=="skip" (
   @echo Generate MosterExtra

tests/native_type_test.fbs

@@ -0,0 +1,18 @@
+native_include "vector3d.h";
+native_include "vector3d_pack.h";
+
+namespace Geometry;
+
+struct Vector3D (native_type:"Native::Vector3D")
+{
+  x:double;
+  y:double;
+  z:double;
+}
+
+table ApplicationData
+{
+  vectors:[Vector3D];
+}
+
+root_type ApplicationData;

tests/test.cpp

@@ -40,6 +40,7 @@
 #include "test_assert.h"
 
 #include "flatbuffers/flexbuffers.h"
+#include "native_type_test_generated.h"
 
 // clang-format off
 // Check that char* and uint8_t* are interoperable types.
@@ -2841,6 +2842,29 @@ void FixedLengthArrayTest() {
 #endif
 }
 
+void NativeTypeTest() {
+  const int N = 3;
+
+  Geometry::ApplicationDataT srcDataT;
+  srcDataT.vectors.reserve(N);
+
+  for (int i = 0; i < N; ++i) {
+    srcDataT.vectors.push_back (Native::Vector3D(10 * i + 0.1, 10 * i + 0.2, 10 * i + 0.3));
+  }
+
+  flatbuffers::FlatBufferBuilder fbb;
+  fbb.Finish(Geometry::ApplicationData::Pack(fbb, &srcDataT));
+
+  auto dstDataT =  Geometry::UnPackApplicationData(fbb.GetBufferPointer());
+
+  for (int i = 0; i < N; ++i) {
+    Native::Vector3D& v = dstDataT->vectors[i];
+    TEST_EQ(v.x, 10 * i + 0.1);
+    TEST_EQ(v.y, 10 * i + 0.2);
+    TEST_EQ(v.z, 10 * i + 0.3);
+  }
+}
+
 void FixedLengthArrayJsonTest(bool binary) {  
   // VS10 does not support typed enums, exclude from tests
 #if !defined(_MSC_VER) || _MSC_VER >= 1700
@@ -2984,6 +3008,7 @@ int FlatBufferTests() {
   InvalidFloatTest();
   TestMonsterExtraFloats();
   FixedLengthArrayTest();
+  NativeTypeTest();
   return 0;
 }
 

tests/vector3d.h

@@ -0,0 +1,16 @@
+#ifndef VECTOR3D_H
+#define VECTOR3D_H
+
+namespace Native {
+  struct Vector3D {
+  public:
+    double x;
+    double y;
+    double z;
+
+    Vector3D() = default;
+    Vector3D(double x, double y, double z) { this->x = x; this->y = y; this->z = z; }
+  };
+}
+
+#endif // VECTOR3D_H

tests/vector3d_pack.cpp

@@ -0,0 +1,13 @@
+#include "vector3d_pack.h"
+
+#include "native_type_test_generated.h"
+
+namespace flatbuffers {
+  Geometry::Vector3D Pack(const Native::Vector3D& obj) {
+    return Geometry::Vector3D(obj.x, obj.y, obj.z);
+  }
+
+  const Native::Vector3D UnPack(const Geometry::Vector3D& obj) {
+    return Native::Vector3D(obj.x(), obj.y(), obj.z());
+  }
+}

tests/vector3d_pack.h

@@ -0,0 +1,15 @@
+#ifndef VECTOR3D_PACK_H
+#define VECTOR3D_PACK_H
+
+#include "vector3d.h"
+
+namespace Geometry { 
+  struct Vector3D;
+}
+
+namespace flatbuffers {
+  Geometry::Vector3D Pack(const Native::Vector3D& obj);
+  const Native::Vector3D UnPack(const Geometry::Vector3D& obj);
+}
+
+#endif // VECTOR3D_PACK_H