diff --git a/sprout/iterator/counting_iterator.hpp b/sprout/iterator/counting_iterator.hpp
index 10b6c36a..8ff57ed9 100644
--- a/sprout/iterator/counting_iterator.hpp
+++ b/sprout/iterator/counting_iterator.hpp
@@ -65,7 +65,7 @@ namespace sprout {
 			: current_(it.current_)
 		{}
 		template<typename U>
-		counting_iterator& operator=(counting_iterator<U> const& it) {
+		SPROUT_CXX14_CONSTEXPR counting_iterator& operator=(counting_iterator<U> const& it) {
 			counting_iterator temp(it);
 			temp.swap(*this);
 			return *this;
@@ -76,20 +76,20 @@ namespace sprout {
 		SPROUT_CONSTEXPR pointer operator->() const {
 			return &current_;
 		}
-		counting_iterator& operator++() {
+		SPROUT_CXX14_CONSTEXPR counting_iterator& operator++() {
 			++current_;
 			return *this;
 		}
-		counting_iterator operator++(int) {
+		SPROUT_CXX14_CONSTEXPR counting_iterator operator++(int) {
 			counting_iterator result(*this);
 			++current_;
 			return result;
 		}
-		counting_iterator& operator--() {
+		SPROUT_CXX14_CONSTEXPR counting_iterator& operator--() {
 			--current_;
 			return *this;
 		}
-		counting_iterator operator--(int) {
+		SPROUT_CXX14_CONSTEXPR counting_iterator operator--(int) {
 			counting_iterator temp(*this);
 			--current_;
 			return temp;
@@ -100,12 +100,12 @@ namespace sprout {
 		SPROUT_CONSTEXPR counting_iterator operator-(difference_type n) const {
 			return counting_iterator(current_ - n);
 		}
-		counting_iterator& operator+=(difference_type n) {
+		SPROUT_CXX14_CONSTEXPR counting_iterator& operator+=(difference_type n) {
 			counting_iterator temp(current_ + n);
 			temp.swap(*this);
 			return *this;
 		}
-		counting_iterator& operator-=(difference_type n) {
+		SPROUT_CXX14_CONSTEXPR counting_iterator& operator-=(difference_type n) {
 			counting_iterator temp(current_ - n);
 			temp.swap(*this);
 			return *this;
@@ -119,7 +119,7 @@ namespace sprout {
 		SPROUT_CONSTEXPR counting_iterator prev() const {
 			return counting_iterator(current_ - 1);
 		}
-		void swap(counting_iterator& other)
+		SPROUT_CXX14_CONSTEXPR void swap(counting_iterator& other)
 		SPROUT_NOEXCEPT_EXPR(SPROUT_NOEXCEPT_EXPR(sprout::swap(current_, other.current_)))
 		{
 			sprout::swap(current_, other.current_);
@@ -184,7 +184,7 @@ namespace sprout {
 	// swap
 	//
 	template<typename Incrementable>
-	inline void
+	inline SPROUT_CXX14_CONSTEXPR void
 	swap(sprout::counting_iterator<Incrementable>& lhs, sprout::counting_iterator<Incrementable>& rhs)
 	SPROUT_NOEXCEPT_EXPR(SPROUT_NOEXCEPT_EXPR(lhs.swap(rhs)))
 	{
diff --git a/sprout/iterator/generator_iterator.hpp b/sprout/iterator/generator_iterator.hpp
index ce9acf1c..84a25cfd 100644
--- a/sprout/iterator/generator_iterator.hpp
+++ b/sprout/iterator/generator_iterator.hpp
@@ -51,7 +51,7 @@ namespace sprout {
 			)
 			: gen_(gen), index_(index)
 		{}
-		generator_type& generator() {
+		SPROUT_CXX14_CONSTEXPR generator_type& generator() {
 			return gen_;
 		}
 		SPROUT_CONSTEXPR generator_type const& generator() const {
@@ -72,7 +72,7 @@ namespace sprout {
 		SPROUT_CONSTEXPR generator_iterator next_generator() const {
 			return (*this)();
 		}
-		void swap(generator_iterator& other)
+		SPROUT_CXX14_CONSTEXPR void swap(generator_iterator& other)
 		SPROUT_NOEXCEPT_EXPR(SPROUT_NOEXCEPT_EXPR(sprout::swap(gen_, other.gen_)))
 		{
 			sprout::swap(gen_, other.gen_);
@@ -84,12 +84,12 @@ namespace sprout {
 		SPROUT_CONSTEXPR pointer operator->() const {
 			return &*(*this);
 		}
-		generator_iterator& operator++() {
+		SPROUT_CXX14_CONSTEXPR generator_iterator& operator++() {
 			generator_iterator temp((*this)());
 			temp.swap(*this);
 			return *this;
 		}
-		generator_iterator operator++(int) {
+		SPROUT_CXX14_CONSTEXPR generator_iterator operator++(int) {
 			generator_iterator result(*this);
 			++*this;
 			return result;
@@ -136,7 +136,7 @@ namespace sprout {
 	// swap
 	//
 	template<typename Generator>
-	inline void
+	inline SPROUT_CXX14_CONSTEXPR void
 	swap(sprout::generator_iterator<Generator>& lhs, sprout::generator_iterator<Generator>& rhs)
 	SPROUT_NOEXCEPT_EXPR(SPROUT_NOEXCEPT_EXPR(lhs.swap(rhs)))
 	{
diff --git a/sprout/iterator/index_iterator.hpp b/sprout/iterator/index_iterator.hpp
index 02835e62..edf56131 100644
--- a/sprout/iterator/index_iterator.hpp
+++ b/sprout/iterator/index_iterator.hpp
@@ -101,7 +101,7 @@ namespace sprout {
 		SPROUT_CONSTEXPR index_iterator(typename holder_type::param_type p, difference_type index)
 			: holder_(p), index_(index)
 		{}
-		operator index_iterator<const_container_type>() const {
+		SPROUT_CONSTEXPR operator index_iterator<const_container_type>() const {
 			return index_iterator<const_container_type>(holder_.get(), index_);
 		}
 		SPROUT_CONSTEXPR typename holder_type::mutable_or_const_reference base() const {
@@ -116,7 +116,7 @@ namespace sprout {
 		SPROUT_CONSTEXPR index_iterator prev() const {
 			return index_iterator(holder_, index_ - 1);
 		}
-		void swap(index_iterator& other)
+		SPROUT_CXX14_CONSTEXPR void swap(index_iterator& other)
 		SPROUT_NOEXCEPT_EXPR(SPROUT_NOEXCEPT_EXPR(sprout::swap(holder_, other.holder_)))
 		{
 			sprout::swap(holder_, other.holder_);
@@ -128,22 +128,22 @@ namespace sprout {
 		SPROUT_CONSTEXPR pointer operator->() const {
 			return &holder_.get()[index_];
 		}
-		index_iterator& operator++() {
+		SPROUT_CXX14_CONSTEXPR index_iterator& operator++() {
 			index_iterator temp(next());
 			temp.swap(*this);
 			return *this;
 		}
-		index_iterator operator++(int) {
+		SPROUT_CXX14_CONSTEXPR index_iterator operator++(int) {
 			index_iterator result(*this);
 			++*this;
 			return result;
 		}
-		index_iterator& operator--() {
+		SPROUT_CXX14_CONSTEXPR index_iterator& operator--() {
 			index_iterator temp(prev());
 			temp.swap(*this);
 			return *this;
 		}
-		index_iterator operator--(int) {
+		SPROUT_CXX14_CONSTEXPR index_iterator operator--(int) {
 			index_iterator result(*this);
 			--*this;
 			return result;
@@ -154,12 +154,12 @@ namespace sprout {
 		SPROUT_CONSTEXPR index_iterator operator-(difference_type n) const {
 			return index_iterator(holder_, index_ - n);
 		}
-		index_iterator& operator+=(difference_type n) {
+		SPROUT_CXX14_CONSTEXPR index_iterator& operator+=(difference_type n) {
 			index_iterator temp(holder_, index_ + n);
 			temp.swap(*this);
 			return *this;
 		}
-		index_iterator& operator-=(difference_type n) {
+		SPROUT_CXX14_CONSTEXPR index_iterator& operator-=(difference_type n) {
 			index_iterator temp(holder_, index_ - n);
 			temp.swap(*this);
 			return *this;
@@ -238,7 +238,7 @@ namespace sprout {
 	// swap
 	//
 	template<typename Container, bool C>
-	inline void
+	inline SPROUT_CXX14_CONSTEXPR void
 	swap(sprout::index_iterator<Container, C>& lhs, sprout::index_iterator<Container, C>& rhs)
 	SPROUT_NOEXCEPT_EXPR(SPROUT_NOEXCEPT_EXPR(lhs.swap(rhs)))
 	{
diff --git a/sprout/iterator/ptr_index_iterator.hpp b/sprout/iterator/ptr_index_iterator.hpp
index 100914bf..3944d62a 100644
--- a/sprout/iterator/ptr_index_iterator.hpp
+++ b/sprout/iterator/ptr_index_iterator.hpp
@@ -68,7 +68,7 @@ namespace sprout {
 		SPROUT_CONSTEXPR ptr_index_iterator(pointer p, difference_type index)
 			: p_(p), index_(index)
 		{}
-		operator ptr_index_iterator<const_pointer>() const {
+		SPROUT_CONSTEXPR operator ptr_index_iterator<const_pointer>() const {
 			return ptr_index_iterator<const_pointer>(p_, index_);
 		}
 		SPROUT_CONSTEXPR pointer base() const {
@@ -86,7 +86,7 @@ namespace sprout {
 		SPROUT_CONSTEXPR ptr_index_iterator prev() const {
 			return ptr_index_iterator(p_, index_ - 1);
 		}
-		void swap(ptr_index_iterator& other)
+		SPROUT_CXX14_CONSTEXPR void swap(ptr_index_iterator& other)
 		SPROUT_NOEXCEPT
 		{
 			sprout::swap(p_, other.p_);
@@ -98,22 +98,22 @@ namespace sprout {
 		SPROUT_CONSTEXPR pointer operator->() const {
 			return p_ + index_;
 		}
-		ptr_index_iterator& operator++() {
+		SPROUT_CXX14_CONSTEXPR ptr_index_iterator& operator++() {
 			ptr_index_iterator temp(next());
 			temp.swap(*this);
 			return *this;
 		}
-		ptr_index_iterator operator++(int) {
+		SPROUT_CXX14_CONSTEXPR ptr_index_iterator operator++(int) {
 			ptr_index_iterator result(*this);
 			++*this;
 			return result;
 		}
-		ptr_index_iterator& operator--() {
+		SPROUT_CXX14_CONSTEXPR ptr_index_iterator& operator--() {
 			ptr_index_iterator temp(prev());
 			temp.swap(*this);
 			return *this;
 		}
-		ptr_index_iterator operator--(int) {
+		SPROUT_CXX14_CONSTEXPR ptr_index_iterator operator--(int) {
 			ptr_index_iterator result(*this);
 			--*this;
 			return result;
@@ -124,12 +124,12 @@ namespace sprout {
 		SPROUT_CONSTEXPR ptr_index_iterator operator-(difference_type n) const {
 			return ptr_index_iterator(p_, index_ - n);
 		}
-		ptr_index_iterator& operator+=(difference_type n) {
+		SPROUT_CXX14_CONSTEXPR ptr_index_iterator& operator+=(difference_type n) {
 			ptr_index_iterator temp(p_, index_ + n);
 			temp.swap(*this);
 			return *this;
 		}
-		ptr_index_iterator& operator-=(difference_type n) {
+		SPROUT_CXX14_CONSTEXPR ptr_index_iterator& operator-=(difference_type n) {
 			ptr_index_iterator temp(p_, index_ - n);
 			temp.swap(*this);
 			return *this;
@@ -208,7 +208,7 @@ namespace sprout {
 	// swap
 	//
 	template<typename T>
-	inline void
+	inline SPROUT_CXX14_CONSTEXPR void
 	swap(sprout::ptr_index_iterator<T>& lhs, sprout::ptr_index_iterator<T>& rhs)
 	SPROUT_NOEXCEPT_EXPR(SPROUT_NOEXCEPT_EXPR(lhs.swap(rhs)))
 	{
diff --git a/sprout/iterator/value_iterator.hpp b/sprout/iterator/value_iterator.hpp
index da2423e6..3637b238 100644
--- a/sprout/iterator/value_iterator.hpp
+++ b/sprout/iterator/value_iterator.hpp
@@ -73,7 +73,7 @@ namespace sprout {
 			)
 			: holder_(p), index_(index)
 		{}
-		operator value_iterator<const_type>() const {
+		SPROUT_CONSTEXPR operator value_iterator<const_type>() const {
 			return value_iterator<const_type>(holder_.get(), index_);
 		}
 		SPROUT_CONSTEXPR difference_type index() const {
@@ -85,7 +85,7 @@ namespace sprout {
 		SPROUT_CONSTEXPR value_iterator prev() const {
 			return value_iterator(holder_, index_ + 1);
 		}
-		void swap(value_iterator& other)
+		SPROUT_CXX14_CONSTEXPR void swap(value_iterator& other)
 		SPROUT_NOEXCEPT_EXPR(SPROUT_NOEXCEPT_EXPR(sprout::swap(holder_, other.holder_)))
 		{
 			sprout::swap(holder_, other.holder_);
@@ -97,22 +97,22 @@ namespace sprout {
 		SPROUT_CONSTEXPR pointer operator->() const {
 			return holder_.get_pointer();
 		}
-		value_iterator& operator++() {
+		SPROUT_CXX14_CONSTEXPR value_iterator& operator++() {
 			value_iterator temp(next());
 			temp.swap(*this);
 			return *this;
 		}
-		value_iterator operator++(int) {
+		SPROUT_CXX14_CONSTEXPR value_iterator operator++(int) {
 			value_iterator result(*this);
 			++*this;
 			return result;
 		}
-		value_iterator& operator--() {
+		SPROUT_CXX14_CONSTEXPR value_iterator& operator--() {
 			value_iterator temp(prev());
 			temp.swap(*this);
 			return *this;
 		}
-		value_iterator operator--(int) {
+		SPROUT_CXX14_CONSTEXPR value_iterator operator--(int) {
 			value_iterator result(*this);
 			--*this;
 			return result;
@@ -123,12 +123,12 @@ namespace sprout {
 		SPROUT_CONSTEXPR value_iterator operator-(difference_type n) const {
 			return value_iterator(holder_, index_ + n);
 		}
-		value_iterator& operator+=(difference_type n) {
+		SPROUT_CXX14_CONSTEXPR value_iterator& operator+=(difference_type n) {
 			value_iterator temp(holder_, index_ - n);
 			temp.swap(*this);
 			return *this;
 		}
-		value_iterator& operator-=(difference_type n) {
+		SPROUT_CXX14_CONSTEXPR value_iterator& operator-=(difference_type n) {
 			value_iterator temp(holder_, index_ + n);
 			temp.swap(*this);
 			return *this;
@@ -183,7 +183,7 @@ namespace sprout {
 	// swap
 	//
 	template<typename T>
-	inline void
+	inline SPROUT_CXX14_CONSTEXPR void
 	swap(sprout::value_iterator<T>& lhs, sprout::value_iterator<T>& rhs)
 	SPROUT_NOEXCEPT_EXPR(SPROUT_NOEXCEPT_EXPR(lhs.swap(rhs)))
 	{
diff --git a/tools/testspr/test.py b/tools/testspr/test.py
index a22bf331..52a8903f 100644
--- a/tools/testspr/test.py
+++ b/tools/testspr/test.py
@@ -25,6 +25,7 @@ def main():
 	parser.add_option('--clang_root', type='string', default='/usr/local')
 	parser.add_option('--compile_options', type='string', default='')
 	parser.add_option('--test_cpp', type='string')
+	parser.add_option('--serialized_std_options', type='string', default='{}')
 	parser.add_option('--serialized_version_specific_options', type='string', default='{}')
 	parser.add_option('--max_procs', type='int', default=0)
 	(opts, args) = parser.parse_args()
@@ -37,10 +38,12 @@ def main():
 		compiler = "%s/%s/bin/%s++" % (root, base, name.rstrip('c')) if version != "." else "%s++" % name.rstrip('c')
 		return "%s -o %s" \
 			" %s %s" \
+			" %s" \
 			" %s > %s 2>&1" \
 			" && %s > %s 2>&1" \
 			% (compiler, bin,
-				opts.compile_options, eval(opts.serialized_version_specific_options).get(base, ''),
+				eval(opts.serialized_std_options).get(base, ''), opts.compile_options,
+				eval(opts.serialized_version_specific_options).get(base, ''),
 				opts.test_cpp, compile_log,
 				bin, execute_log
 				)
diff --git a/tools/testspr/test.sh b/tools/testspr/test.sh
index 3c0a8415..270567c0 100755
--- a/tools/testspr/test.sh
+++ b/tools/testspr/test.sh
@@ -19,6 +19,7 @@ declare -a include_paths=()
 max_procs=
 force=0
 use_help=0
+std="c++11"
 declare -a common_options=()
 declare -a version_options=()
 declare -A version_specific_options=(
@@ -27,7 +28,31 @@ declare -A version_specific_options=(
 test_cpp=$(cd $(dirname $0); pwd)/test.cpp
 test_py=$(cd $(dirname $0); pwd)/test.py
 
-args=`getopt -o S:g:c:O:V:D:I:P:f -l stagedir:,gcc-version:,clang-version:,gcc-root:,clang-root:,option:,version-option:,define:,include:,max-procs:,force,help -- "$@"`
+get_std_option() {
+	if [ "${3}" = "c++1y" ]; then
+		if [ "${1}" = "gcc" ]; then
+			if [ "${2}" = "." ]; then
+				echo -n "-std=c++1y"
+			elif [ "${2//.}" -lt "480" ]; then
+				echo -n "-std=c++11"
+			else
+				echo -n "-std=c++1y"
+			fi
+		elif [ "${1}" = "clang" ]; then
+			if [ "${2}" = "." ]; then
+				echo -n "-std=c++1y"
+			elif [ "${2//.}" -lt "32" ]; then
+				echo -n "-std=c++11"
+			else
+				echo -n "-std=c++1y"
+			fi
+		fi
+	else
+		echo -n "-std=c++11"
+	fi
+}
+
+args=`getopt -o S:g:c:O:V:D:I:P:f -l stagedir:,gcc-version:,clang-version:,gcc-root:,clang-root:,std:,option:,version-option:,define:,include:,max-procs:,force,help -- "$@"`
 if [ "$?" -ne 0 ]; then
 	echo >&2 "error: options parse error. See 'test.sh --help'"
 	exit 1
@@ -40,6 +65,7 @@ while [ -n "$1" ]; do
 		-c|--clang-version) clang_version="$2"; shift 2;;
 		--gcc-root) gcc_root="$2"; shift 2;;
 		--clang-root) clang_root="$2"; shift 2;;
+		--std) std="$2"; shift 2;;
 		-O|--option) common_options=("${common_options[@]}" "$2"); shift 2;;
 		-V|--version-option) version_options=("${version_options[@]}" "$2"); shift 2;;
 		-D|--define) user_macros=("${user_macros[@]}" "$2"); shift 2;;
@@ -72,6 +98,9 @@ if [ ${use_help} -ne 0 ]; then
 	echo "      --clang-root=<dir>      Root directory that clang installed."
 	echo "                              Default; '/usr/local'"
 	echo ""
+	echo "      --std=<c++XX>           Standard C++ version."
+	echo "                              Default; 'c++11'"
+	echo ""
 	echo "  -O, --option=<opt>          Add compile option."
 	echo ""
 	echo "  -V, --version-option=<opt>  Add version specific compile option."
@@ -97,6 +126,7 @@ echo "  gcc-version = (${gcc_version})"
 echo "  clang-version = (${clang_version})"
 echo "  gcc-root = '${gcc_root}'"
 echo "  clang-root = '${clang_root}'"
+echo "  std = '${std}'"
 echo "  common-options = (${common_options[*]})"
 echo "  version-options = (${version_options[*]})"
 echo "  user-macros = (${user_macros[*]})"
@@ -110,7 +140,7 @@ done
 for include_path in ${include_paths}; do
 	include_options="${include_options} -I${include_path}"
 done
-compile_options="-v -Wall -pedantic -std=c++11 ${define_options} ${include_options} ${common_options[*]}"
+compile_options="-v -Wall -pedantic ${define_options} ${include_options} ${common_options[*]}"
 vo=0
 vkey=""
 for option in ${version_options}; do
@@ -172,11 +202,13 @@ compile() {
 if [ -z "${max_procs}" ]; then
 	fail_count=0
 	for version in ${gcc_version}; do
-		compile "gcc" "${version}" "${test_cpp}" "${compile_options}" "${gcc_root}"
+		std_option=`get_std_option "gcc" "${version}" "${std}"`
+		compile "gcc" "${version}" "${test_cpp}" "${std_option} ${compile_options}" "${gcc_root}"
 		let fail_count=${fail_count}+$?
 	done
 	for version in ${clang_version}; do
-		compile "clang" "${version}" "${test_cpp}" "${compile_options}" "${clang_root}"
+		std_option=`get_std_option "clang" "${version}" "${std}"`
+		compile "clang" "${version}" "${test_cpp}" "${std_option} ${compile_options}" "${clang_root}"
 		let fail_count=${fail_count}+$?
 	done
 	if [ ${fail_count} -ne 0 ]; then
@@ -193,11 +225,33 @@ else
 		done
 		echo \'_\':\'\'
 	`}
+	serialized_std_options={`
+		for version in ${gcc_version}; do
+			if [ "${version}" = "." ]; then
+				echo -n \'gcc\':\'
+			else
+				echo -n \'gcc-${version}\':\'
+			fi
+			get_std_option "gcc" "${version}" "${std}"
+			echo \',
+		done
+		for version in ${clang_version}; do
+			if [ "${version}" = "." ]; then
+				echo -n \'clang\':\'
+			else
+				echo -n \'clang-${version}\':\'
+			fi
+			get_std_option "clang" "${version}" "${std}"
+			echo \',
+		done
+		echo \'_\':\'\'
+	`}
 	python "${test_py}" \
 		"--stagedir=${stagedir}" \
 		"--gcc_version=${gcc_version}" "--clang_version=${clang_version}" \
 		"--gcc_root=${gcc_root}" "--clang_root=${clang_root}" \
 		"--compile_options=${compile_options}" "--test_cpp=${test_cpp}" \
+		"--serialized_std_options=${serialized_std_options}" \
 		"--serialized_version_specific_options=${serialized_version_specific_options}" \
 		"--max_procs=${max_procs}"
 	fail_count=$?