diff --git a/CMakeLists.txt b/CMakeLists.txt
index 51ee620..5971bb7 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -20,6 +20,8 @@ option(RAPIDJSON_BUILD_TESTS "Build rapidjson perftests and unittests." ON)
 option(RAPIDJSON_BUILD_THIRDPARTY_GTEST
     "Use gtest installation in `thirdparty/gtest` by default if available" OFF)
 
+option(RAPIDJSON_BUILD_CXX11 "Build rapidjson with C++11 (gcc/clang)" ON)
+
 option(RAPIDJSON_HAS_STDSTRING "" OFF)
 if(RAPIDJSON_HAS_STDSTRING)
     add_definitions(-DRAPIDJSON_HAS_STDSTRING)
@@ -27,8 +29,14 @@ endif()
 
 if ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU")
     set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -march=native -Wall -Wextra -Werror")
+    if (RAPIDJSON_BUILD_CXX11)
+        set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
+    endif()
 elseif (CMAKE_CXX_COMPILER_ID MATCHES "Clang")
     set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -march=native -Wall -Wextra -Werror -Wno-missing-field-initializers")
+    if (RAPIDJSON_BUILD_CXX11)
+        set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
+    endif()
 elseif ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "MSVC")
     add_definitions(-D_CRT_SECURE_NO_WARNINGS=1)
 endif()
diff --git a/example/serialize/serialize.cpp b/example/serialize/serialize.cpp
index 6c5e5c2..cef5c66 100644
--- a/example/serialize/serialize.cpp
+++ b/example/serialize/serialize.cpp
@@ -11,6 +11,7 @@ using namespace rapidjson;
 class Person {
 public:
     Person(const std::string& name, unsigned age) : name_(name), age_(age) {}
+    Person(const Person& rhs) : name_(rhs.name_), age_(rhs.age_) {}
     virtual ~Person();
 
 protected:
@@ -38,6 +39,7 @@ Person::~Person() {
 class Education {
 public:
     Education(const std::string& school, double GPA) : school_(school), GPA_(GPA) {}
+    Education(const Education& rhs) : school_(rhs.school_), GPA_(rhs.GPA_) {}
 
     template <typename Writer>
     void Serialize(Writer& writer) const {
@@ -102,6 +104,7 @@ Dependent::~Dependent() {
 class Employee : public Person {
 public:
     Employee(const std::string& name, unsigned age, bool married) : Person(name, age), dependents_(), married_(married) {}
+    Employee(const Employee& rhs) : Person(rhs), dependents_(rhs.dependents_), married_(rhs.married_) {}
     virtual ~Employee();
 
     void AddDependent(const Dependent& dependent) {
diff --git a/include/rapidjson/document.h b/include/rapidjson/document.h
index 095aa40..12187ea 100644
--- a/include/rapidjson/document.h
+++ b/include/rapidjson/document.h
@@ -31,6 +31,7 @@ RAPIDJSON_DIAG_OFF(4127) // conditional expression is constant
 RAPIDJSON_DIAG_PUSH
 RAPIDJSON_DIAG_OFF(padded)
 RAPIDJSON_DIAG_OFF(switch-enum)
+RAPIDJSON_DIAG_OFF(c++98-compat)
 #endif
 
 #ifdef __GNUC__
@@ -141,6 +142,7 @@ public:
             Otherwise, the copy constructor is implicitly defined.
     */
     GenericMemberIterator(const NonConstIterator & it) : ptr_(it.ptr_) {}
+    Iterator& operator=(const NonConstIterator & it) { ptr_ = it.ptr_; return *this; }
 
     //! @name stepping
     //@{
@@ -314,8 +316,6 @@ struct GenericStringRef {
     const SizeType length; //!< length of the string (excluding the trailing NULL terminator)
 
 private:
-    //! Disallow copy-assignment
-    GenericStringRef operator=(const GenericStringRef&);
     //! Disallow construction from non-const array
     template<SizeType N>
     GenericStringRef(CharType (&str)[N]) /* = delete */;
diff --git a/include/rapidjson/internal/stack.h b/include/rapidjson/internal/stack.h
index 3d691d3..12f8a8f 100644
--- a/include/rapidjson/internal/stack.h
+++ b/include/rapidjson/internal/stack.h
@@ -18,6 +18,11 @@
 #include "../rapidjson.h"
 #include "swap.h"
 
+#if defined(__clang__)
+RAPIDJSON_DIAG_PUSH
+RAPIDJSON_DIAG_OFF(c++98-compat)
+#endif
+
 RAPIDJSON_NAMESPACE_BEGIN
 namespace internal {
 
@@ -203,4 +208,8 @@ private:
 } // namespace internal
 RAPIDJSON_NAMESPACE_END
 
+#if defined(__clang__)
+RAPIDJSON_DIAG_POP
+#endif
+
 #endif // RAPIDJSON_STACK_H_
diff --git a/include/rapidjson/internal/swap.h b/include/rapidjson/internal/swap.h
index 39bc2e4..cbb2abd 100644
--- a/include/rapidjson/internal/swap.h
+++ b/include/rapidjson/internal/swap.h
@@ -17,6 +17,11 @@
 
 #include "../rapidjson.h"
 
+#if defined(__clang__)
+RAPIDJSON_DIAG_PUSH
+RAPIDJSON_DIAG_OFF(c++98-compat)
+#endif
+
 RAPIDJSON_NAMESPACE_BEGIN
 namespace internal {
 
@@ -34,4 +39,8 @@ inline void Swap(T& a, T& b) RAPIDJSON_NOEXCEPT {
 } // namespace internal
 RAPIDJSON_NAMESPACE_END
 
+#if defined(__clang__)
+RAPIDJSON_DIAG_POP
+#endif
+
 #endif // RAPIDJSON_INTERNAL_SWAP_H_
diff --git a/include/rapidjson/stringbuffer.h b/include/rapidjson/stringbuffer.h
index 40b51cd..0d32859 100644
--- a/include/rapidjson/stringbuffer.h
+++ b/include/rapidjson/stringbuffer.h
@@ -23,6 +23,11 @@
 
 #include "internal/stack.h"
 
+#if defined(__clang__)
+RAPIDJSON_DIAG_PUSH
+RAPIDJSON_DIAG_OFF(c++98-compat)
+#endif
+
 RAPIDJSON_NAMESPACE_BEGIN
 
 //! Represents an in-memory output stream.
@@ -103,4 +108,8 @@ inline void PutN(GenericStringBuffer<UTF8<> >& stream, char c, size_t n) {
 
 RAPIDJSON_NAMESPACE_END
 
+#if defined(__clang__)
+RAPIDJSON_DIAG_POP
+#endif
+
 #endif // RAPIDJSON_STRINGBUFFER_H_
diff --git a/test/unittest/documenttest.cpp b/test/unittest/documenttest.cpp
index cdc4c31..c3438f3 100644
--- a/test/unittest/documenttest.cpp
+++ b/test/unittest/documenttest.cpp
@@ -21,6 +21,12 @@
 #include <sstream>
 #include <algorithm>
 
+#ifdef __clang__
+RAPIDJSON_DIAG_PUSH
+RAPIDJSON_DIAG_OFF(c++98-compat)
+RAPIDJSON_DIAG_OFF(missing-variable-declarations)
+#endif
+
 using namespace rapidjson;
 
 template <typename DocumentType>
@@ -573,3 +579,7 @@ TYPED_TEST(DocumentMove, MoveAssignmentStack) {
 //  Document d2;
 //  d1 = d2;
 //}
+
+#ifdef __clang__
+RAPIDJSON_DIAG_POP
+#endif
diff --git a/test/unittest/readertest.cpp b/test/unittest/readertest.cpp
index 3b84ab7..49888a9 100644
--- a/test/unittest/readertest.cpp
+++ b/test/unittest/readertest.cpp
@@ -31,6 +31,7 @@ RAPIDJSON_DIAG_OFF(missing-noreturn)
 #ifdef __clang__
 RAPIDJSON_DIAG_PUSH
 RAPIDJSON_DIAG_OFF(variadic-macros)
+RAPIDJSON_DIAG_OFF(c++98-compat-pedantic)
 #endif
 
 template<bool expect>
diff --git a/test/unittest/stringbuffertest.cpp b/test/unittest/stringbuffertest.cpp
index fbacf51..28fdbc5 100644
--- a/test/unittest/stringbuffertest.cpp
+++ b/test/unittest/stringbuffertest.cpp
@@ -16,6 +16,11 @@
 #include "rapidjson/stringbuffer.h"
 #include "rapidjson/writer.h"
 
+#ifdef __clang__
+RAPIDJSON_DIAG_PUSH
+RAPIDJSON_DIAG_OFF(c++98-compat)
+#endif
+
 using namespace rapidjson;
 
 TEST(StringBuffer, InitialSize) {
@@ -148,3 +153,7 @@ TEST(StringBuffer, MoveAssignment) {
 }
 
 #endif // RAPIDJSON_HAS_CXX11_RVALUE_REFS
+
+#ifdef __clang__
+RAPIDJSON_DIAG_POP
+#endif
diff --git a/test/unittest/unittest.cpp b/test/unittest/unittest.cpp
index dd562a2..655518a 100644
--- a/test/unittest/unittest.cpp
+++ b/test/unittest/unittest.cpp
@@ -15,8 +15,19 @@
 #include "unittest.h"
 #include "rapidjson/rapidjson.h"
 
+#ifdef __clang__
+#pragma GCC diagnostic push
+#if __has_warning("-Wdeprecated")
+#pragma GCC diagnostic ignored "-Wdeprecated"
+#endif
+#endif
+
 AssertException::~AssertException() throw() {}
 
+#ifdef __clang__
+#pragma GCC diagnostic pop
+#endif
+
 int main(int argc, char **argv) {
     ::testing::InitGoogleTest(&argc, argv);
 
diff --git a/test/unittest/unittest.h b/test/unittest/unittest.h
index 6062410..60e6c18 100644
--- a/test/unittest/unittest.h
+++ b/test/unittest/unittest.h
@@ -99,12 +99,24 @@ inline FILE* TempFile(char *filename) {
 #pragma warning(disable : 4127)
 #endif
 
+#ifdef __clang__
+#pragma GCC diagnostic push
+#if __has_warning("-Wdeprecated")
+#pragma GCC diagnostic ignored "-Wdeprecated"
+#endif
+#endif
+
 class AssertException : public std::logic_error {
 public:
     AssertException(const char* w) : std::logic_error(w) {}
+    AssertException(const AssertException& rhs) : std::logic_error(rhs) {}
     virtual ~AssertException() throw();
 };
 
+#ifdef __clang__
+#pragma GCC diagnostic pop
+#endif
+
 #define RAPIDJSON_ASSERT(x) if (!(x)) throw AssertException(RAPIDJSON_STRINGIFY(x))
 
 class Random {
diff --git a/test/unittest/valuetest.cpp b/test/unittest/valuetest.cpp
index 245ccac..b2963fc 100644
--- a/test/unittest/valuetest.cpp
+++ b/test/unittest/valuetest.cpp
@@ -16,6 +16,11 @@
 #include "rapidjson/document.h"
 #include <algorithm>
 
+#ifdef __clang__
+RAPIDJSON_DIAG_PUSH
+RAPIDJSON_DIAG_OFF(c++98-compat)
+#endif
+
 using namespace rapidjson;
 
 TEST(Value, DefaultConstructor) {
@@ -764,15 +769,15 @@ TEST(Value, Array) {
 #if RAPIDJSON_HAS_CXX11_RVALUE_REFS
     // PushBack(GenericValue&&, Allocator&);
     {
-        Value y(kArrayType);
-        y.PushBack(Value(true), allocator);
-        y.PushBack(std::move(Value(kArrayType).PushBack(Value(1), allocator).PushBack("foo", allocator)), allocator);
-        EXPECT_EQ(2u, y.Size());
-        EXPECT_TRUE(y[0].IsTrue());
-        EXPECT_TRUE(y[1].IsArray());
-        EXPECT_EQ(2u, y[1].Size());
-        EXPECT_TRUE(y[1][0].IsInt());
-        EXPECT_TRUE(y[1][1].IsString());
+        Value y2(kArrayType);
+        y2.PushBack(Value(true), allocator);
+        y2.PushBack(std::move(Value(kArrayType).PushBack(Value(1), allocator).PushBack("foo", allocator)), allocator);
+        EXPECT_EQ(2u, y2.Size());
+        EXPECT_TRUE(y2[0].IsTrue());
+        EXPECT_TRUE(y2[1].IsArray());
+        EXPECT_EQ(2u, y2[1].Size());
+        EXPECT_TRUE(y2[1][0].IsInt());
+        EXPECT_TRUE(y2[1][1].IsString());
     }
 #endif
 
@@ -1354,3 +1359,27 @@ TEST(Value, AcceptTerminationByHandler) {
     TEST_TERMINATION(11, "{\"a\":[]}");
     TEST_TERMINATION(12, "{\"a\":[]}");
 }
+
+struct ValueIntComparer {
+    bool operator()(const Value& lhs, const Value& rhs) const {
+        return lhs.GetInt() < rhs.GetInt();
+    }
+};
+
+#if RAPIDJSON_HAS_CXX11_RVALUE_REFS
+TEST(Value, Sorting) {
+    Value::AllocatorType allocator;
+    Value a(kArrayType);
+    a.PushBack(5, allocator);
+    a.PushBack(1, allocator);
+    a.PushBack(3, allocator);
+    std::sort(a.Begin(), a.End(), ValueIntComparer());
+    EXPECT_EQ(1, a[0].GetInt());
+    EXPECT_EQ(3, a[1].GetInt());
+    EXPECT_EQ(5, a[2].GetInt());
+}
+#endif
+
+#ifdef __clang__
+RAPIDJSON_DIAG_POP
+#endif