pull in latest 10.4 from upstream

1 files changed, 1 insertions, 70 deletions

diff --git a/zen/legacy_compiler.h b/zen/legacy_compiler.h
index 5a0013b3..e9d50b97 100755
--- a/zen/legacy_compiler.h
+++ b/zen/legacy_compiler.h
@@ -7,82 +7,13 @@
 #ifndef LEGACY_COMPILER_H_839567308565656789
 #define LEGACY_COMPILER_H_839567308565656789
 
-    #include <memory>
-    #include <cstddef> //std::byte
-
+    #include <optional>
 
 namespace std
 {
 //https://gcc.gnu.org/onlinedocs/libstdc++/manual/status.html
 //https://isocpp.org/std/standing-documents/sd-6-sg10-feature-test-recommendations
 
-#ifndef __cpp_lib_type_trait_variable_templates //GCC 7.1
-    template<class T, class U> constexpr bool is_same_v = is_same<T, U>::value;
-    template<class T> constexpr bool is_const_v  = is_const<T>::value;
-    template<class T> constexpr bool is_signed_v = is_signed<T>::value;
-    template<class T> constexpr bool is_trivially_destructible_v = is_trivially_destructible<T>::value;
-#endif
-
-#if __GNUC__ < 7 || (__GNUC__ == 7 && __GNUC_MINOR__ < 1) //GCC doesn't define __cpp_lib_raw_memory_algorithms
-template<class T> void destroy_at(T* p) { p->~T(); }
-
-template< class ForwardIt >
-void destroy(ForwardIt first, ForwardIt last)
-{
-    for (; first != last; ++first)
-        std::destroy_at(std::addressof(*first));
-}
-
-template<class InputIt, class ForwardIt>
-ForwardIt uninitialized_move(InputIt first, InputIt last, ForwardIt trg_first)
-{
-    typedef typename std::iterator_traits<ForwardIt>::value_type Value;
-    ForwardIt current = trg_first;
-    try
-    {
-        for (; first != last; ++first, ++current)
-            ::new (static_cast<void*>(std::addressof(*current))) Value(std::move(*first));
-        return current;
-    }
-    catch (...)
-    {
-        for (; trg_first != current; ++trg_first)
-            trg_first->~Value();
-        throw;
-    }
-}
-#endif
-
-#ifndef __cpp_lib_apply //GCC 7.1
-template <class F, class T0, class T1, class T2>
-constexpr decltype(auto) apply(F&& f, std::tuple<T0, T1, T2>& t) { return f(std::get<0>(t), std::get<1>(t), std::get<2>(t)); }
-#endif
-
-#if __GNUC__ < 7 || (__GNUC__ == 7 && __GNUC_MINOR__ < 1) //__cpp_lib_byte not defined before GCC 7.3 but supported earlier
-    typedef unsigned char byte;
-#endif
-
-#ifndef __cpp_lib_bool_constant //GCC 6.1
-    template<bool B> using bool_constant = integral_constant<bool, B>;
-#endif
-
-//================================================================================
-
-}
-namespace __cxxabiv1
-{
-struct __cxa_eh_globals;
-extern "C" __cxa_eh_globals* __cxa_get_globals() noexcept;
-}
-namespace std
-{
-inline int uncaught_exceptions_legacy_hack() noexcept
-{
-    return *(reinterpret_cast<unsigned int*>(static_cast<char*>(static_cast<void*>(__cxxabiv1::__cxa_get_globals())) + sizeof(void*)));
-}
-#ifndef __cpp_lib_uncaught_exceptions //GCC 6.1
-inline int uncaught_exceptions() noexcept { return uncaught_exceptions_legacy_hack(); }
-#endif
 
 }