Add checks for std::chrono and std::function

CMakeLists.txt

@@ -74,7 +74,8 @@ OPTION(LIBTINS_ENABLE_CXX11 "Compile libtins with c++11 features" ON)
 IF(LIBTINS_ENABLE_CXX11)
     # We only use declval and decltype on gcc/clang as VC fails to build that code,
     # at least on VC2013
-    IF(HAS_CXX11_RVALUE_REFERENCES AND ((HAS_CXX11_DECLVAL AND HAS_CXX11_DECLTYPE) OR MSVC))
+    IF(HAS_CXX11_RVALUE_REFERENCES AND HAS_CXX11_FUNCTIONAL AND HAS_CXX11_CHRONO AND
+       ((HAS_CXX11_DECLVAL AND HAS_CXX11_DECLTYPE) OR MSVC))
         SET(HAVE_CXX11 ON)
         MESSAGE(STATUS "Enabling C++11 features")
         SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${CXX11_COMPILER_FLAGS}")

cmake/Modules/CheckCXXFeatures.cmake

@@ -142,4 +142,6 @@ cxx11_check_feature("decltype" HAS_CXX11_DECLTYPE)
 cxx11_check_feature("declval" HAS_CXX11_DECLVAL)
 cxx11_check_feature("initializer_list" HAS_CXX11_INITIALIZER_LIST)
 cxx11_check_feature("rvalue-references" HAS_CXX11_RVALUE_REFERENCES)
+cxx11_check_feature("functional" HAS_CXX11_FUNCTIONAL)
+cxx11_check_feature("chrono" HAS_CXX11_CHRONO)
 cxx11_check_feature("builtin-swap" HAS_GCC_BUILTIN_SWAP)

cmake/Modules/CheckCXXFeatures/cxx-test-chrono.cpp

@@ -0,0 +1,9 @@
+#include <chrono>
+
+using namespace std::chrono;
+
+int main() {
+    system_clock::time_point tp = system_clock::now();
+    milliseconds ms = duration_cast<milliseconds>(tp.time_since_epoch());
+    return (ms.count() > 0) ? 0 : 1;
+}

cmake/Modules/CheckCXXFeatures/cxx-test-functional.cpp

@@ -0,0 +1,11 @@
+#include <functional>
+
+int add(int x, int y) {
+    return x + y;
+}
+
+int main() {
+    std::function<int(int, int)> func;
+    func = std::bind(&add, std::placeholders::_1, std::placeholders::_2);
+    return (func(2, 2) == 4) ? 0 : 1;
+}

examples/stream_dump.cpp

@@ -40,6 +40,7 @@ using std::cerr;
 using std::endl;
 using std::bind;
 using std::string;
+using std::to_string;
 using std::ostringstream;
 using std::exception;