Add two C++ examples (one in C++ and the other in C++11) with std::vector.

Add C++11 autodetection in autotools.

configure.ac

@@ -81,6 +81,14 @@ AC_PROG_FC
 AC_CHECK_PROGS(PROG_STAT,gstat stat)
 AC_CHECK_PROGS(PROG_DATE,gdate date)
 AC_OPENMP
+#c++11 detection
+AX_CXX_COMPILE_STDCXX(11,noext,optional)
+
+AC_SUBST([STARPU_HAVE_CXX11], [test "$HAVE_CXX11" -eq 1])
+AM_CONDITIONAL([STARPU_HAVE_CXX11], [test "$HAVE_CXX11" -eq 1])
+if test $HAVE_CXX11 -eq 1; then
+  AC_DEFINE(STARPU_HAVE_CXX11, [1], [compiler supports cxx11])
+fi
 
 if test x$enable_perf_debug = xyes; then
     enable_shared=no

examples/Makefile.am

@@ -201,6 +201,7 @@ STARPU_EXAMPLES +=				\
 	basic_examples/dynamic_handles          \
 	mlr/mlr					\
 	cpp/incrementer_cpp			\
+	cpp/add_vectors				\
 	filters/fvector				\
 	filters/fblock				\
 	filters/fmatrix				\
@@ -229,12 +230,18 @@ STARPU_EXAMPLES +=				\
 	worker_collections/worker_tree_example  \
 	reductions/dot_product			\
 	reductions/minmax_reduction
+
 endif
 
 if !STARPU_SIMGRID
 STARPU_EXAMPLES +=				\
 	scheduler/dummy_sched
 
+if STARPU_HAVE_CXX11
+STARPU_EXAMPLES +=	\
+	cpp/add_vectors_cpp11
+endif
+
 if STARPU_HAVE_F77
 if STARPU_HAVE_F77_H
 STARPU_EXAMPLES +=				\
@@ -838,6 +845,18 @@ cpp_incrementer_cpp_SOURCES += \
 	incrementer/incrementer_kernels_opencl.c
 endif
 
+###########################
+# C++ Add vectors example #
+###########################
+
+cpp_add_vectors_SOURCES	=	\
+	cpp/add_vectors.cpp
+	
+if STARPU_HAVE_CXX11
+cpp_add_vectors_cpp11_SOURCES	=	\
+	cpp/add_vectors_cpp11.cpp
+endif
+
 #######################
 # Incrementer example #
 #######################

examples/cpp/Makefile.add_vectors

@@ -0,0 +1,37 @@
+# StarPU --- Runtime system for heterogeneous multicore architectures.
+#
+# Copyright (C) 2016  Inria
+#
+# StarPU is free software; you can redistribute it and/or modify
+# it under the terms of the GNU Lesser General Public License as published by
+# the Free Software Foundation; either version 2.1 of the License, or (at
+# your option) any later version.
+#
+# StarPU is distributed in the hope that it will be useful, but
+# WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+#
+# See the GNU Lesser General Public License in COPYING.LGPL for more details.
+
+PROG = add_vectors
+
+SRCCXX = add_vectors.cpp
+
+CC = g++
+
+CFLAGS = -g -DPRINT_OUTPUT $(shell pkg-config --cflags starpu-1.3)
+LDLIBS =  $(shell pkg-config --libs starpu-1.3)
+
+OBJS = $(SRCCXX:%.cpp=%.o)
+
+.phony: all clean
+all: $(PROG)
+
+$(PROG): $(OBJS)
+	$(CC) $(LDFLAGS) -o $@ $^ $(LDLIBS)
+
+%.o: %.cpp
+	$(CC) $(CFLAGS) -c -o $@ $<
+
+clean:
+	rm -fv *.o $(PROG)

examples/cpp/Makefile.add_vectors_cpp11

@@ -0,0 +1,37 @@
+# StarPU --- Runtime system for heterogeneous multicore architectures.
+#
+# Copyright (C) 2016  Inria
+#
+# StarPU is free software; you can redistribute it and/or modify
+# it under the terms of the GNU Lesser General Public License as published by
+# the Free Software Foundation; either version 2.1 of the License, or (at
+# your option) any later version.
+#
+# StarPU is distributed in the hope that it will be useful, but
+# WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+#
+# See the GNU Lesser General Public License in COPYING.LGPL for more details.
+
+PROG = add_vectors_cpp11
+
+SRCCXX = add_vectors_cpp11.cpp
+
+CC = g++
+
+CFLAGS = -g -std=c++11 -DPRINT_OUTPUT $(shell pkg-config --cflags starpu-1.3)
+LDLIBS =  $(shell pkg-config --libs starpu-1.3)
+
+OBJS = $(SRCCXX:%.cpp=%.o)
+
+.phony: all clean
+all: $(PROG)
+
+$(PROG): $(OBJS)
+	$(CC) $(LDFLAGS) -o $@ $^ $(LDLIBS)
+
+%.o: %.cpp
+	$(CC) $(CFLAGS) -c -o $@ $<
+
+clean:
+	rm -fv *.o $(PROG)

examples/cpp/add_vectors.cpp

@@ -0,0 +1,134 @@
+/* StarPU --- Runtime system for heterogeneous multicore architectures.
+ *
+ * Copyright (C) 2009, 2010-2011, 2013-2015  Université de Bordeaux
+ * Copyright (C) 2010, 2011, 2012, 2013, 2014  CNRS
+ * Copyright (C) 2012 INRIA
+ *
+ * StarPU is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation; either version 2.1 of the License, or (at
+ * your option) any later version.
+ *
+ * StarPU is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * See the GNU Lesser General Public License in COPYING.LGPL for more details.
+ */
+
+/*
+ * This is a small example of a C++ program using starpu.  We here just
+ * add two std::vector without copying them (0 copy).
+ */
+
+#include <cassert>
+#include <vector>
+
+#ifdef PRINT_OUTPUT
+#include <iostream>
+#endif
+
+#include <starpu.h>
+
+void cpu_kernel_add_vectors(void *buffers[], void *cl_arg)
+{
+	// get the current task
+	starpu_task* task = starpu_task_get_current();
+
+	// get the user data (pointers to the vec_A, vec_B, vec_C std::vector)
+	void* u_data0 = starpu_data_get_user_data(task->handles[0]); assert(u_data0);
+	void* u_data1 = starpu_data_get_user_data(task->handles[1]); assert(u_data1);
+	void* u_data2 = starpu_data_get_user_data(task->handles[2]); assert(u_data2);
+	
+	// cast void* in std::vector<char>*
+	std::vector<char>* vec_A = static_cast<std::vector<char>*>(u_data0);
+	std::vector<char>* vec_B = static_cast<std::vector<char>*>(u_data1);
+	std::vector<char>* vec_C = static_cast<std::vector<char>*>(u_data2);
+	
+	// all the std::vector have to have the same size
+	assert(vec_A->size() == vec_B->size() && vec_B->size() == vec_C->size());
+	
+	// performs the vector addition (vec_C[] = vec_A[] + vec_B[])
+	for (size_t i = 0; i < vec_C->size(); i++)
+		(*vec_C)[i] = (*vec_A)[i] + (*vec_B)[i];
+}
+
+#define VEC_SIZE 1024
+
+int main(int argc, char **argv)
+{
+	std::vector<char> vec_A(VEC_SIZE, 2); // all the vector is initialized to 2
+	std::vector<char> vec_B(VEC_SIZE, 3); // all the vector is initialized to 3
+	std::vector<char> vec_C(VEC_SIZE, 0); // all the vector is initialized to 0
+
+	// initialize StarPU with default configuration
+	int ret = starpu_init(NULL);
+	STARPU_CHECK_RETURN_VALUE(ret, "starpu_init");
+
+	// StarPU data registering
+	starpu_data_handle_t spu_vec_A;
+	starpu_data_handle_t spu_vec_B;
+	starpu_data_handle_t spu_vec_C;
+	
+	// give the data of the vector to StarPU (C array)
+	starpu_vector_data_register(&spu_vec_A, STARPU_MAIN_RAM, (uintptr_t)&vec_A[0], vec_A.size(), sizeof(char));
+	starpu_vector_data_register(&spu_vec_B, STARPU_MAIN_RAM, (uintptr_t)&vec_B[0], vec_B.size(), sizeof(char));
+	starpu_vector_data_register(&spu_vec_C, STARPU_MAIN_RAM, (uintptr_t)&vec_C[0], vec_C.size(), sizeof(char));
+	
+	// pass the pointer to the C++ vector object to StarPU
+	starpu_data_set_user_data(spu_vec_A, (void*)&vec_A);
+	starpu_data_set_user_data(spu_vec_B, (void*)&vec_B);
+	starpu_data_set_user_data(spu_vec_C, (void*)&vec_C);
+	
+	// create the StarPU codelet
+	starpu_codelet cl;
+	starpu_codelet_init(&cl);
+	cl.cpu_funcs     [0] = cpu_kernel_add_vectors;
+	cl.cpu_funcs_name[0] = "cpu_kernel_add_vectors";
+	cl.nbuffers          = 3;
+	cl.modes         [0] = STARPU_R;
+	cl.modes         [1] = STARPU_R;
+	cl.modes         [2] = STARPU_W;
+	cl.name              = "add_vectors";
+	
+	// submit a new StarPU task to execute
+	ret = starpu_task_insert(&cl,
+	                         STARPU_R, spu_vec_A,
+	                         STARPU_R, spu_vec_B,
+	                         STARPU_W, spu_vec_C,
+	                         0);
+	
+	STARPU_CHECK_RETURN_VALUE(ret, "task_submit::add_vectors");
+	
+	// wait the task
+	starpu_task_wait_for_all();
+	
+	// StarPU data unregistering
+	starpu_data_unregister(spu_vec_C);
+	starpu_data_unregister(spu_vec_B);
+	starpu_data_unregister(spu_vec_A);
+
+	// terminate StarPU, no task can be submitted after
+	starpu_shutdown();
+
+	// check results
+	bool fail = false;
+	int i = 0;
+	while (!fail && i < VEC_SIZE)
+		fail = vec_C[i++] != 5;
+		
+	if (fail)
+	{
+#ifdef PRINT_OUTPUT
+		std::cout << "Example failed..." << std::endl;
+#endif
+		return EXIT_FAILURE;
+	}
+	else
+	{
+#ifdef PRINT_OUTPUT
+		std::cout << "Example successfully passed!" << std::endl;
+#endif
+		return EXIT_SUCCESS;
+	}
+}

examples/cpp/add_vectors_cpp11.cpp

@@ -0,0 +1,140 @@
+/* StarPU --- Runtime system for heterogeneous multicore architectures.
+ *
+ * Copyright (C) 2009, 2010-2011, 2013-2015  Université de Bordeaux
+ * Copyright (C) 2010, 2011, 2012, 2013, 2014  CNRS
+ * Copyright (C) 2012 INRIA
+ *
+ * StarPU is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation; either version 2.1 of the License, or (at
+ * your option) any later version.
+ *
+ * StarPU is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * See the GNU Lesser General Public License in COPYING.LGPL for more details.
+ */
+
+/*
+ * This is a small example of a C++ program using starpu.  We here just
+ * add two std::vector without copying them (0 copy).
+ */
+
+#include <cassert>
+#include <vector>
+
+#ifdef PRINT_OUTPUT
+#include <iostream>
+#endif
+
+#include <starpu.h>
+#if !defined(STARPU_HAVE_CXX11)
+int main(int argc, char **argv)
+{
+	return STARPU_TEST_SKIPPED;
+}
+#else
+void cpu_kernel_add_vectors(void *buffers[], void *cl_arg)
+{
+	// get the current task
+	auto task = starpu_task_get_current();
+
+	// get the user data (pointers to the vec_A, vec_B, vec_C std::vector)
+	auto u_data0 = starpu_data_get_user_data(task->handles[0]); assert(u_data0);
+	auto u_data1 = starpu_data_get_user_data(task->handles[1]); assert(u_data1);
+	auto u_data2 = starpu_data_get_user_data(task->handles[2]); assert(u_data2);
+	
+	// cast void* in std::vector<char>*
+	auto vec_A = static_cast<std::vector<char>*>(u_data0);
+	auto vec_B = static_cast<std::vector<char>*>(u_data1);
+	auto vec_C = static_cast<std::vector<char>*>(u_data2);
+	
+	// all the std::vector have to have the same size
+	assert(vec_A->size() == vec_B->size() && vec_B->size() == vec_C->size());
+	
+	// performs the vector addition (vec_C[] = vec_A[] + vec_B[])
+	for (size_t i = 0; i < vec_C->size(); i++)
+		(*vec_C)[i] = (*vec_A)[i] + (*vec_B)[i];
+}
+
+int main(int argc, char **argv)
+{
+	constexpr int vec_size = 1024;
+	
+	std::vector<char> vec_A(vec_size, 2); // all the vector is initialized to 2
+	std::vector<char> vec_B(vec_size, 3); // all the vector is initialized to 3
+	std::vector<char> vec_C(vec_size, 0); // all the vector is initialized to 0
+
+	// initialize StarPU with default configuration
+	auto ret = starpu_init(NULL);
+	STARPU_CHECK_RETURN_VALUE(ret, "starpu_init");
+
+	// StarPU data registering
+	starpu_data_handle_t spu_vec_A;
+	starpu_data_handle_t spu_vec_B;
+	starpu_data_handle_t spu_vec_C;
+	
+	// give the data of the vector to StarPU (C array)
+	starpu_vector_data_register(&spu_vec_A, STARPU_MAIN_RAM, (uintptr_t)vec_A.data(), vec_A.size(), sizeof(char));
+	starpu_vector_data_register(&spu_vec_B, STARPU_MAIN_RAM, (uintptr_t)vec_B.data(), vec_B.size(), sizeof(char));
+	starpu_vector_data_register(&spu_vec_C, STARPU_MAIN_RAM, (uintptr_t)vec_C.data(), vec_C.size(), sizeof(char));
+	
+	// pass the pointer to the C++ vector object to StarPU
+	starpu_data_set_user_data(spu_vec_A, (void*)&vec_A);
+	starpu_data_set_user_data(spu_vec_B, (void*)&vec_B);
+	starpu_data_set_user_data(spu_vec_C, (void*)&vec_C);
+	
+	// create the StarPU codelet
+	starpu_codelet cl;
+	starpu_codelet_init(&cl);
+	cl.cpu_funcs     [0] = cpu_kernel_add_vectors;
+	cl.cpu_funcs_name[0] = "cpu_kernel_add_vectors";
+	cl.nbuffers          = 3;
+	cl.modes         [0] = STARPU_R;
+	cl.modes         [1] = STARPU_R;
+	cl.modes         [2] = STARPU_W;
+	cl.name              = "add_vectors";
+	
+	// submit a new StarPU task to execute
+	ret = starpu_task_insert(&cl,
+	                         STARPU_R, spu_vec_A,
+	                         STARPU_R, spu_vec_B,
+	                         STARPU_W, spu_vec_C,
+	                         0);
+	
+	STARPU_CHECK_RETURN_VALUE(ret, "task_submit::add_vectors");
+	
+	// wait the task
+	starpu_task_wait_for_all();
+	
+	// StarPU data unregistering
+	starpu_data_unregister(spu_vec_C);
+	starpu_data_unregister(spu_vec_B);
+	starpu_data_unregister(spu_vec_A);
+
+	// terminate StarPU, no task can be submitted after
+	starpu_shutdown();
+
+	// check results
+	auto fail = false;
+	auto i = 0;
+	while (!fail && i < vec_size)
+		fail = vec_C[i++] != 5;
+		
+	if (fail)
+	{
+#ifdef PRINT_OUTPUT
+		std::cout << "Example failed..." << std::endl;
+#endif
+		return EXIT_FAILURE;
+	}
+	else
+	{
+#ifdef PRINT_OUTPUT
+		std::cout << "Example successfully passed!" << std::endl;
+#endif
+		return EXIT_SUCCESS;
+	}
+}
+#endif

include/starpu_config.h.in

@@ -145,4 +145,6 @@ typedef ssize_t starpu_ssize_t;
 
 #undef STARPU_HAVE_DARWIN
 
+#undef STARPU_HAVE_CXX11
+
 #endif

m4/ax_cxx_compile_stdcxx.m4

@@ -0,0 +1,562 @@
+# ===========================================================================
+#   http://www.gnu.org/software/autoconf-archive/ax_cxx_compile_stdcxx.html
+# ===========================================================================
+#
+# SYNOPSIS
+#
+#   AX_CXX_COMPILE_STDCXX(VERSION, [ext|noext], [mandatory|optional])
+#
+# DESCRIPTION
+#
+#   Check for baseline language coverage in the compiler for the specified
+#   version of the C++ standard.  If necessary, add switches to CXX and
+#   CXXCPP to enable support.  VERSION may be '11' (for the C++11 standard)
+#   or '14' (for the C++14 standard).
+#
+#   The second argument, if specified, indicates whether you insist on an
+#   extended mode (e.g. -std=gnu++11) or a strict conformance mode (e.g.
+#   -std=c++11).  If neither is specified, you get whatever works, with
+#   preference for an extended mode.
+#
+#   The third argument, if specified 'mandatory' or if left unspecified,
+#   indicates that baseline support for the specified C++ standard is
+#   required and that the macro should error out if no mode with that
+#   support is found.  If specified 'optional', then configuration proceeds
+#   regardless, after defining HAVE_CXX${VERSION} if and only if a
+#   supporting mode is found.
+#
+# LICENSE
+#
+#   Copyright (c) 2008 Benjamin Kosnik <bkoz@redhat.com>
+#   Copyright (c) 2012 Zack Weinberg <zackw@panix.com>
+#   Copyright (c) 2013 Roy Stogner <roystgnr@ices.utexas.edu>
+#   Copyright (c) 2014, 2015 Google Inc.; contributed by Alexey Sokolov <sokolov@google.com>
+#   Copyright (c) 2015 Paul Norman <penorman@mac.com>
+#   Copyright (c) 2015 Moritz Klammler <moritz@klammler.eu>
+#
+#   Copying and distribution of this file, with or without modification, are
+#   permitted in any medium without royalty provided the copyright notice
+#   and this notice are preserved.  This file is offered as-is, without any
+#   warranty.
+
+#serial 4
+
+dnl  This macro is based on the code from the AX_CXX_COMPILE_STDCXX_11 macro
+dnl  (serial version number 13).
+
+AC_DEFUN([AX_CXX_COMPILE_STDCXX], [dnl
+  m4_if([$1], [11], [],
+        [$1], [14], [],
+        [$1], [17], [m4_fatal([support for C++17 not yet implemented in AX_CXX_COMPILE_STDCXX])],
+        [m4_fatal([invalid first argument `$1' to AX_CXX_COMPILE_STDCXX])])dnl
+  m4_if([$2], [], [],
+        [$2], [ext], [],
+        [$2], [noext], [],
+        [m4_fatal([invalid second argument `$2' to AX_CXX_COMPILE_STDCXX])])dnl
+  m4_if([$3], [], [ax_cxx_compile_cxx$1_required=true],
+        [$3], [mandatory], [ax_cxx_compile_cxx$1_required=true],
+        [$3], [optional], [ax_cxx_compile_cxx$1_required=false],
+        [m4_fatal([invalid third argument `$3' to AX_CXX_COMPILE_STDCXX])])
+  AC_LANG_PUSH([C++])dnl
+  ac_success=no
+  AC_CACHE_CHECK(whether $CXX supports C++$1 features by default,
+  ax_cv_cxx_compile_cxx$1,
+  [AC_COMPILE_IFELSE([AC_LANG_SOURCE([_AX_CXX_COMPILE_STDCXX_testbody_$1])],
+    [ax_cv_cxx_compile_cxx$1=yes],
+    [ax_cv_cxx_compile_cxx$1=no])])
+  if test x$ax_cv_cxx_compile_cxx$1 = xyes; then
+    ac_success=yes
+  fi
+
+  m4_if([$2], [noext], [], [dnl
+  if test x$ac_success = xno; then
+    for switch in -std=gnu++$1 -std=gnu++0x; do
+      cachevar=AS_TR_SH([ax_cv_cxx_compile_cxx$1_$switch])
+      AC_CACHE_CHECK(whether $CXX supports C++$1 features with $switch,
+                     $cachevar,
+        [ac_save_CXX="$CXX"
+         CXX="$CXX $switch"
+         AC_COMPILE_IFELSE([AC_LANG_SOURCE([_AX_CXX_COMPILE_STDCXX_testbody_$1])],
+          [eval $cachevar=yes],
+          [eval $cachevar=no])
+         CXX="$ac_save_CXX"])
+      if eval test x\$$cachevar = xyes; then
+        CXX="$CXX $switch"
+        if test -n "$CXXCPP" ; then
+          CXXCPP="$CXXCPP $switch"
+        fi
+        ac_success=yes
+        break
+      fi
+    done
+  fi])
+
+  m4_if([$2], [ext], [], [dnl
+  if test x$ac_success = xno; then
+    dnl HP's aCC needs +std=c++11 according to:
+    dnl http://h21007.www2.hp.com/portal/download/files/unprot/aCxx/PDF_Release_Notes/769149-001.pdf
+    dnl Cray's crayCC needs "-h std=c++11"
+    for switch in -std=c++$1 -std=c++0x +std=c++$1 "-h std=c++$1"; do
+      cachevar=AS_TR_SH([ax_cv_cxx_compile_cxx$1_$switch])
+      AC_CACHE_CHECK(whether $CXX supports C++$1 features with $switch,
+                     $cachevar,
+        [ac_save_CXX="$CXX"
+         CXX="$CXX $switch"
+         AC_COMPILE_IFELSE([AC_LANG_SOURCE([_AX_CXX_COMPILE_STDCXX_testbody_$1])],
+          [eval $cachevar=yes],
+          [eval $cachevar=no])
+         CXX="$ac_save_CXX"])
+      if eval test x\$$cachevar = xyes; then
+        CXX="$CXX $switch"
+        if test -n "$CXXCPP" ; then
+          CXXCPP="$CXXCPP $switch"
+        fi
+        ac_success=yes
+        break
+      fi
+    done
+  fi])
+  AC_LANG_POP([C++])
+  if test x$ax_cxx_compile_cxx$1_required = xtrue; then
+    if test x$ac_success = xno; then
+      AC_MSG_ERROR([*** A compiler with support for C++$1 language features is required.])
+    fi
+  fi
+  if test x$ac_success = xno; then
+    HAVE_CXX$1=0
+    AC_MSG_NOTICE([No compiler with C++$1 support was found])
+  else
+    HAVE_CXX$1=1
+    AC_DEFINE(HAVE_CXX$1,1,
+              [define if the compiler supports basic C++$1 syntax])
+  fi
+  AC_SUBST(HAVE_CXX$1)
+])
+
+
+dnl  Test body for checking C++11 support
+
+m4_define([_AX_CXX_COMPILE_STDCXX_testbody_11],
+  _AX_CXX_COMPILE_STDCXX_testbody_new_in_11
+)
+
+
+dnl  Test body for checking C++14 support
+
+m4_define([_AX_CXX_COMPILE_STDCXX_testbody_14],
+  _AX_CXX_COMPILE_STDCXX_testbody_new_in_11
+  _AX_CXX_COMPILE_STDCXX_testbody_new_in_14
+)
+
+
+dnl  Tests for new features in C++11
+
+m4_define([_AX_CXX_COMPILE_STDCXX_testbody_new_in_11], [[
+
+// If the compiler admits that it is not ready for C++11, why torture it?
+// Hopefully, this will speed up the test.
+
+#ifndef __cplusplus
+
+#error "This is not a C++ compiler"
+
+#elif __cplusplus < 201103L
+
+#error "This is not a C++11 compiler"
+
+#else
+
+namespace cxx11
+{
+
+  namespace test_static_assert
+  {
+
+    template <typename T>
+    struct check
+    {
+      static_assert(sizeof(int) <= sizeof(T), "not big enough");
+    };
+
+  }
+
+  namespace test_final_override
+  {
+
+    struct Base
+    {
+      virtual void f() {}
+    };
+
+    struct Derived : public Base
+    {
+      virtual void f() override {}
+    };
+
+  }
+
+  namespace test_double_right_angle_brackets
+  {
+
+    template < typename T >
+    struct check {};
+
+    typedef check<void> single_type;
+    typedef check<check<void>> double_type;
+    typedef check<check<check<void>>> triple_type;
+    typedef check<check<check<check<void>>>> quadruple_type;
+
+  }
+
+  namespace test_decltype
+  {
+
+    int
+    f()
+    {
+      int a = 1;
+      decltype(a) b = 2;
+      return a + b;
+    }
+
+  }
+
+  namespace test_type_deduction
+  {
+
+    template < typename T1, typename T2 >
+    struct is_same
+    {
+      static const bool value = false;
+    };
+
+    template < typename T >
+    struct is_same<T, T>
+    {
+      static const bool value = true;
+    };
+
+    template < typename T1, typename T2 >
+    auto
+    add(T1 a1, T2 a2) -> decltype(a1 + a2)
+    {
+      return a1 + a2;
+    }
+
+    int
+    test(const int c, volatile int v)
+    {
+      static_assert(is_same<int, decltype(0)>::value == true, "");
+      static_assert(is_same<int, decltype(c)>::value == false, "");
+      static_assert(is_same<int, decltype(v)>::value == false, "");
+      auto ac = c;
+      auto av = v;
+      auto sumi = ac + av + 'x';
+      auto sumf = ac + av + 1.0;
+      static_assert(is_same<int, decltype(ac)>::value == true, "");
+      static_assert(is_same<int, decltype(av)>::value == true, "");
+      static_assert(is_same<int, decltype(sumi)>::value == true, "");
+      static_assert(is_same<int, decltype(sumf)>::value == false, "");
+      static_assert(is_same<int, decltype(add(c, v))>::value == true, "");
+      return (sumf > 0.0) ? sumi : add(c, v);
+    }
+
+  }
+
+  namespace test_noexcept
+  {
+
+    int f() { return 0; }
+    int g() noexcept { return 0; }
+
+    static_assert(noexcept(f()) == false, "");
+    static_assert(noexcept(g()) == true, "");
+
+  }
+
+  namespace test_constexpr
+  {
+
+    template < typename CharT >
+    unsigned long constexpr
+    strlen_c_r(const CharT *const s, const unsigned long acc) noexcept
+    {
+      return *s ? strlen_c_r(s + 1, acc + 1) : acc;
+    }
+
+    template < typename CharT >
+    unsigned long constexpr
+    strlen_c(const CharT *const s) noexcept
+    {
+      return strlen_c_r(s, 0UL);
+    }
+
+    static_assert(strlen_c("") == 0UL, "");
+    static_assert(strlen_c("1") == 1UL, "");
+    static_assert(strlen_c("example") == 7UL, "");
+    static_assert(strlen_c("another\0example") == 7UL, "");
+
+  }
+
+  namespace test_rvalue_references
+  {
+
+    template < int N >
+    struct answer
+    {
+      static constexpr int value = N;
+    };
+
+    answer<1> f(int&)       { return answer<1>(); }
+    answer<2> f(const int&) { return answer<2>(); }
+    answer<3> f(int&&)      { return answer<3>(); }
+
+    void
+    test()
+    {
+      int i = 0;
+      const int c = 0;
+      static_assert(decltype(f(i))::value == 1, "");
+      static_assert(decltype(f(c))::value == 2, "");
+      static_assert(decltype(f(0))::value == 3, "");
+    }
+
+  }
+
+  namespace test_uniform_initialization
+  {
+
+    struct test
+    {
+      static const int zero {};
+      static const int one {1};
+    };
+
+    static_assert(test::zero == 0, "");
+    static_assert(test::one == 1, "");
+
+  }
+
+  namespace test_lambdas
+  {
+
+    void
+    test1()
+    {
+      auto lambda1 = [](){};
+      auto lambda2 = lambda1;
+      lambda1();
+      lambda2();
+    }
+
+    int
+    test2()
+    {
+      auto a = [](int i, int j){ return i + j; }(1, 2);
+      auto b = []() -> int { return '0'; }();
+      auto c = [=](){ return a + b; }();
+      auto d = [&](){ return c; }();
+      auto e = [a, &b](int x) mutable {
+        const auto identity = [](int y){ return y; };
+        for (auto i = 0; i < a; ++i)
+          a += b--;
+        return x + identity(a + b);
+      }(0);
+      return a + b + c + d + e;
+    }
+
+    int
+    test3()
+    {
+      const auto nullary = [](){ return 0; };
+      const auto unary = [](int x){ return x; };
+      using nullary_t = decltype(nullary);
+      using unary_t = decltype(unary);
+      const auto higher1st = [](nullary_t f){ return f(); };
+      const auto higher2nd = [unary](nullary_t f1){
+        return [unary, f1](unary_t f2){ return f2(unary(f1())); };
+      };
+      return higher1st(nullary) + higher2nd(nullary)(unary);
+    }
+
+  }
+
+  namespace test_variadic_templates
+  {
+
+    template <int...>
+    struct sum;
+
+    template <int N0, int... N1toN>
+    struct sum<N0, N1toN...>
+    {
+      static constexpr auto value = N0 + sum<N1toN...>::value;
+    };
+
+    template <>
+    struct sum<>
+    {
+      static constexpr auto value = 0;
+    };
+
+    static_assert(sum<>::value == 0, "");
+    static_assert(sum<1>::value == 1, "");
+    static_assert(sum<23>::value == 23, "");
+    static_assert(sum<1, 2>::value == 3, "");
+    static_assert(sum<5, 5, 11>::value == 21, "");
+    static_assert(sum<2, 3, 5, 7, 11, 13>::value == 41, "");
+
+  }
+
+  // http://stackoverflow.com/questions/13728184/template-aliases-and-sfinae
+  // Clang 3.1 fails with headers of libstd++ 4.8.3 when using std::function
+  // because of this.
+  namespace test_template_alias_sfinae
+  {
+
+    struct foo {};
+
+    template<typename T>
+    using member = typename T::member_type;
+
+    template<typename T>
+    void func(...) {}
+
+    template<typename T>
+    void func(member<T>*) {}
+
+    void test();
+
+    void test() { func<foo>(0); }
+
+  }
+
+}  // namespace cxx11
+
+#endif  // __cplusplus >= 201103L
+
+]])
+
+
+dnl  Tests for new features in C++14
+
+m4_define([_AX_CXX_COMPILE_STDCXX_testbody_new_in_14], [[
+
+// If the compiler admits that it is not ready for C++14, why torture it?
+// Hopefully, this will speed up the test.
+
+#ifndef __cplusplus
+
+#error "This is not a C++ compiler"
+
+#elif __cplusplus < 201402L
+
+#error "This is not a C++14 compiler"
+
+#else
+
+namespace cxx14
+{
+
+  namespace test_polymorphic_lambdas
+  {
+
+    int
+    test()
+    {
+      const auto lambda = [](auto&&... args){
+        const auto istiny = [](auto x){
+          return (sizeof(x) == 1UL) ? 1 : 0;
+        };
+        const int aretiny[] = { istiny(args)... };
+        return aretiny[0];
+      };
+      return lambda(1, 1L, 1.0f, '1');
+    }
+
+  }
+
+  namespace test_binary_literals
+  {
+
+    constexpr auto ivii = 0b0000000000101010;
+    static_assert(ivii == 42, "wrong value");
+
+  }
+
+  namespace test_generalized_constexpr
+  {
+
+    template < typename CharT >
+    constexpr unsigned long
+    strlen_c(const CharT *const s) noexcept
+    {
+      auto length = 0UL;
+      for (auto p = s; *p; ++p)
+        ++length;
+      return length;
+    }
+
+    static_assert(strlen_c("") == 0UL, "");
+    static_assert(strlen_c("x") == 1UL, "");
+    static_assert(strlen_c("test") == 4UL, "");
+    static_assert(strlen_c("another\0test") == 7UL, "");
+
+  }
+
+  namespace test_lambda_init_capture
+  {
+
+    int
+    test()
+    {
+      auto x = 0;
+      const auto lambda1 = [a = x](int b){ return a + b; };
+      const auto lambda2 = [a = lambda1(x)](){ return a; };
+      return lambda2();
+    }
+
+  }
+
+  namespace test_digit_seperators
+  {
+
+    constexpr auto ten_million = 100'000'000;
+    static_assert(ten_million == 100000000, "");
+
+  }
+
+  namespace test_return_type_deduction
+  {
+
+    auto f(int& x) { return x; }
+    decltype(auto) g(int& x) { return x; }
+
+    template < typename T1, typename T2 >
+    struct is_same
+    {
+      static constexpr auto value = false;
+    };
+
+    template < typename T >
+    struct is_same<T, T>
+    {
+      static constexpr auto value = true;
+    };
+
+    int
+    test()
+    {
+      auto x = 0;
+      static_assert(is_same<int, decltype(f(x))>::value, "");
+      static_assert(is_same<int&, decltype(g(x))>::value, "");
+      return x;
+    }
+
+  }
+
+}  // namespace cxx14
+
+#endif  // __cplusplus >= 201402L
+
+]])