update ArxTypeTraits

util/ArxTypeTraits/ArxTypeTraits.h

@@ -15,12 +15,12 @@ namespace std { }
 
 // Import everything from the std namespace into arx::std, so that
 // anything we import rather than define is also available through
-// arx::arx_std.
+// arx::stdx.
 // This includes everything yet to be defined, so we can do this early
 // (and must do so, to allow e.g. the C++14 additions in the arx::std
 // namespace to reference the C++11 stuff from the system headers.
 namespace arx {
-    namespace arx_std {
+    namespace stdx {
         using namespace ::std;
     }
 }
@@ -30,9 +30,9 @@ namespace arx {
 // the standard library version if it is available, falling back to arx
 // versions for things not supplied by the standard library. Only when
 // you really need the arx version (e.g. for constexpr numeric_limits
-// when also using ArduinoSTL), you need to qualify with arx::arx_std::
+// when also using ArduinoSTL), you need to qualify with arx::stdx::
 namespace std {
-    using namespace ::arx::arx_std;
+    using namespace ::arx::stdx;
 }
 
 #include "ArxTypeTraits/replace_minmax_macros.h"

util/ArxTypeTraits/ArxTypeTraits/functional.h

@@ -28,7 +28,7 @@
 inline void* operator new (const size_t size, void* ptr) noexcept { (void)size; return ptr; }
 #endif
 
-namespace arx { namespace arx_std {
+namespace arx { namespace stdx {
 
     // reference:
     // stack overflow https://stackoverflow.com/questions/32074410/stdfunction-bind-like-type-erasure-without-standard-c-library

util/ArxTypeTraits/ArxTypeTraits/has_include.h

@@ -17,7 +17,8 @@
             #define ARX_SYSTEM_HAS_INCLUDE(x) 1
         #elif defined(ARDUINO_SAM_DUE)
             // Arduino DUE's GCC version is 4.8.3 (GCC < 5.0).
-            // And it has not libstdc++
+            // If libstdc++ is used, std::function causes error
+            // so currently we disable libstdc++ and use ArxTypeTraits
             #define ARX_SYSTEM_HAS_INCLUDE(x) 0
         #else
             #error "Compiler does not support __has_include, please report a bug against the ArxTypeTraits library about this."

util/ArxTypeTraits/ArxTypeTraits/tuple.h

@@ -9,7 +9,7 @@
 
 #else // Do not have libstdc++11
 
-namespace arx { namespace arx_std {
+namespace arx { namespace stdx {
 
     // https://theolizer.com/cpp-school2/cpp-school2-15/
     // https://wandbox.org/permlink/C0BWIzjqg4iO3kKZ

util/ArxTypeTraits/ArxTypeTraits/type_traits.h

@@ -9,7 +9,7 @@
 
 #else // Do not have libstdc++98
 
-namespace arx { namespace arx_std {
+namespace arx { namespace stdx {
 
     template <class T>
     void swap(T& a, T& b)
@@ -18,7 +18,7 @@ namespace arx { namespace arx_std {
         a = move(b);
         b = move(t);
     }
-} } // namespace arx::arx_std
+} } // namespace arx::stdx
 
 #endif // Do not have libstdc++98
 
@@ -34,7 +34,7 @@ namespace arx { namespace arx_std {
 #include <limits.h>
 #include <stdint.h>
 
-namespace arx { namespace arx_std {
+namespace arx { namespace stdx {
 
     using nullptr_t = decltype(nullptr);
 
@@ -145,10 +145,6 @@ namespace arx { namespace arx_std {
     template<class T, size_t N> struct remove_extent<T[N]> { typedef T type; };
 
 
-    template<class T>
-    T&& move(T& t){ return static_cast<T&&>(t); }
-
-
     template <class T>
     constexpr T&& forward(typename remove_reference<T>::type& t) noexcept
     {
@@ -381,10 +377,31 @@ namespace arx { namespace arx_std {
     template<class Sig>
     using result_of = details::result_of<Sig>;
 
-} } // namespace arx::arx_std
+} } // namespace arx::stdx
 
 #endif // Do not have libstdc++11
 
+
+#if ARX_HAVE_LIBSTDCPLUSPLUS >= 201402L // Have libstdc++14
+
+#else // Do not have libstdc++14
+
+namespace arx { namespace stdx {
+
+    // `move` must be declared before including `functional.h`
+    // C++14 constexpr version should be inside of C++14,
+    // but moved before `functional.h`
+    template <class T>
+    constexpr typename remove_reference<T>::type&& move(T&& t) noexcept
+    {
+        return static_cast<typename remove_reference<T>::type&&>(t);
+    }
+
+} } // namespace arx::stdx
+
+#endif // Do not have libstdc++14
+
+
 #include "initializer_list.h"
 #include "tuple.h"
 #include "functional.h"
@@ -394,7 +411,7 @@ namespace arx { namespace arx_std {
     // for C++11  above.
 #else // Do not have libstdc++14
 
-namespace arx { namespace arx_std {
+namespace arx { namespace stdx {
 
     template <bool B, typename T = void>
     using enable_if_t = typename enable_if<B, T>::type;
@@ -448,7 +465,7 @@ namespace arx { namespace arx_std {
     template<typename... Ts>
     using index_sequence_for = make_index_sequence<sizeof...(Ts)>;
 
-} } // namespace arx::arx_std
+} } // namespace arx::stdx
 
 #endif // Do not have libstdc++14
 
@@ -458,7 +475,7 @@ namespace arx { namespace arx_std {
     // for C++11  above.
 #else // Do not have libstdc++17
 
-namespace arx { namespace arx_std {
+namespace arx { namespace stdx {
 
     template <class... Ts>
     struct Tester { using type = void; };
@@ -506,7 +523,7 @@ namespace arx { namespace arx_std {
         );
     }
 
-} } // namespace arx::arx_std
+} } // namespace arx::stdx
 
 #endif // Do not have libstdc++17
 
@@ -516,7 +533,7 @@ namespace arx { namespace arx_std {
     // for C++11  above.
 #else // Do not have libstdc++2a
 
-namespace arx { namespace arx_std {
+namespace arx { namespace stdx {
 
     template<class T>
     struct remove_cvref
@@ -527,7 +544,7 @@ namespace arx { namespace arx_std {
     template< class T >
     using remove_cvref_t = typename remove_cvref<T>::type;
 
-} } // namespace arx::arx_std
+} } // namespace arx::stdx
 #endif // Do not have libstdc++2a
 
 

util/ArxTypeTraits/README.md

@@ -8,13 +8,13 @@ C++ type_traits for Arduino which cannot use it as default
 - automatically use standard library first if the boards can
 - if standard library is not enough (e.g. only C++11 is available), add missing parts listed below
 - works almost all Arduino platforms (Let me know if you have errors)
-- compatible with [ArduinoSTL](https://github.com/mike-matera/ArduinoSTL) or other [uClibc++](https://www.uclibc.org/) libraries (include them before `ArxTypeTraits`)
+- compatible with [ArduinoSTL](https://github.com/mike-matera/ArduinoSTL) or other [uClibc++](https://www.uclibc.org/) libraries
   - thx @matthijskooijman
 
 
 ## Supported Class Templates
 
-### C++11 (defined only for platforms above which cannot use `type_traits`)
+### C++11 (defined only for boards before C++11)
 
 - `std::integral_constant`
 - `std::true_type`
@@ -102,6 +102,7 @@ C++ type_traits for Arduino which cannot use it as default
 - [PollingTimer](https://github.com/hideakitai/PollingTimer)
 - [Tween](https://github.com/hideakitai/Tween)
 - [ArxStringUtils](https://github.com/hideakitai/ArxStringUtils)
+- [Filters](https://github.com/hideakitai/Filters)
 
 
 ## Contributors