Merge pull request #740 from CreoValis/writer-move-ctor

Move constructor support for Writer

include/rapidjson/prettywriter.h

@@ -22,6 +22,11 @@ RAPIDJSON_DIAG_PUSH
 RAPIDJSON_DIAG_OFF(effc++)
 #endif
 
+#if defined(__clang__)
+RAPIDJSON_DIAG_PUSH
+RAPIDJSON_DIAG_OFF(c++98-compat)
+#endif
+
 RAPIDJSON_NAMESPACE_BEGIN
 
 //! Combination of PrettyWriter format flags.
@@ -57,6 +62,11 @@ public:
     explicit PrettyWriter(StackAllocator* allocator = 0, size_t levelDepth = Base::kDefaultLevelDepth) : 
         Base(allocator, levelDepth), indentChar_(' '), indentCharCount_(4) {}
 
+#if RAPIDJSON_HAS_CXX11_RVALUE_REFS
+    PrettyWriter(PrettyWriter&& rhs) :
+        Base(std::forward<PrettyWriter>(rhs)), indentChar_(rhs.indentChar_), indentCharCount_(rhs.indentCharCount_), formatOptions_(rhs.formatOptions_) {}
+#endif
+
     //! Set custom indentation.
     /*! \param indentChar       Character for indentation. Must be whitespace character (' ', '\\t', '\\n', '\\r').
         \param indentCharCount  Number of indent characters for each indentation level.
@@ -254,6 +264,10 @@ private:
 
 RAPIDJSON_NAMESPACE_END
 
+#if defined(__clang__)
+RAPIDJSON_DIAG_POP
+#endif
+
 #ifdef __GNUC__
 RAPIDJSON_DIAG_POP
 #endif

include/rapidjson/writer.h

@@ -42,6 +42,7 @@ RAPIDJSON_DIAG_OFF(4127) // conditional expression is constant
 RAPIDJSON_DIAG_PUSH
 RAPIDJSON_DIAG_OFF(padded)
 RAPIDJSON_DIAG_OFF(unreachable-code)
+RAPIDJSON_DIAG_OFF(c++98-compat)
 #endif
 
 RAPIDJSON_NAMESPACE_BEGIN
@@ -103,6 +104,13 @@ public:
     Writer(StackAllocator* allocator = 0, size_t levelDepth = kDefaultLevelDepth) :
         os_(0), level_stack_(allocator, levelDepth * sizeof(Level)), maxDecimalPlaces_(kDefaultMaxDecimalPlaces), hasRoot_(false) {}
 
+#if RAPIDJSON_HAS_CXX11_RVALUE_REFS
+    Writer(Writer&& rhs) :
+        os_(rhs.os_), level_stack_(std::move(rhs.level_stack_)), maxDecimalPlaces_(rhs.maxDecimalPlaces_), hasRoot_(rhs.hasRoot_) {
+        rhs.os_=nullptr;
+    }
+#endif
+
     //! Reset the writer with a new stream.
     /*!
         This function reset the writer with a new stream and default settings,

test/unittest/prettywritertest.cpp

@@ -18,6 +18,11 @@
 #include "rapidjson/stringbuffer.h"
 #include "rapidjson/filewritestream.h"
 
+#ifdef __clang__
+RAPIDJSON_DIAG_PUSH
+RAPIDJSON_DIAG_OFF(c++98-compat)
+#endif
+
 using namespace rapidjson;
 
 static const char kJson[] = "{\"hello\":\"world\",\"t\":true,\"f\":false,\"n\":null,\"i\":123,\"pi\":3.1416,\"a\":[1,2,3,-1],\"u64\":1234567890123456789,\"i64\":-1234567890123456789}";
@@ -201,3 +206,29 @@ TEST(PrettyWriter, RawValue) {
         "}",
         buffer.GetString());
 }
+
+#if RAPIDJSON_HAS_CXX11_RVALUE_REFS
+TEST(PrettyWriter, MoveCtor) {
+    StringBuffer buffer;
+    auto writerGen=[](StringBuffer &target) -> PrettyWriter<StringBuffer> {
+        PrettyWriter<StringBuffer> writer(target);
+        writer.StartObject();
+        writer.Key("a");
+        writer.Int(1);
+        return std::move(writer);
+    };
+
+    PrettyWriter<StringBuffer> writer(writerGen(buffer));
+    writer.EndObject();
+    EXPECT_TRUE(writer.IsComplete());
+    EXPECT_STREQ(
+        "{\n"
+        "    \"a\": 1\n"
+        "}",
+        buffer.GetString());
+}
+#endif
+
+#ifdef __clang__
+RAPIDJSON_DIAG_POP
+#endif

test/unittest/writertest.cpp

@@ -20,6 +20,11 @@
 #include "rapidjson/stringbuffer.h"
 #include "rapidjson/memorybuffer.h"
 
+#ifdef __clang__
+RAPIDJSON_DIAG_PUSH
+RAPIDJSON_DIAG_OFF(c++98-compat)
+#endif
+
 using namespace rapidjson;
 
 TEST(Writer, Compact) {
@@ -495,3 +500,25 @@ TEST(Writer, RawValue) {
     EXPECT_TRUE(writer.IsComplete());
     EXPECT_STREQ("{\"a\":1,\"raw\":[\"Hello\\nWorld\", 123.456]}", buffer.GetString());
 }
+
+#if RAPIDJSON_HAS_CXX11_RVALUE_REFS
+TEST(Writer, MoveCtor) {
+    StringBuffer buffer;
+    auto writerGen=[](StringBuffer &target) -> Writer<StringBuffer> {
+        Writer<StringBuffer> writer(target);
+        writer.StartObject();
+        writer.Key("a");
+        writer.Int(1);
+        return std::move(writer);
+    };
+
+    Writer<StringBuffer> writer(writerGen(buffer));
+    writer.EndObject();
+    EXPECT_TRUE(writer.IsComplete());
+    EXPECT_STREQ("{\"a\":1}", buffer.GetString());
+}
+#endif
+
+#ifdef __clang__
+RAPIDJSON_DIAG_POP
+#endif