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Explicitly check for optional and string_view in cases where the C++17 language is operational but the standard library in use does not have those headers.

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add check for using stdlibc++ with clang or icc to make sure is_trivially_copyable is available.
This commit is contained in:
Philip Top 2019-10-12 04:54:21 -07:00
parent ca1ca7caae
commit d5cbaf4682
1 changed files with 18 additions and 3 deletions
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21
zmq.hpp
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@ -87,7 +87,17 @@
#include <memory>
#endif
#ifdef ZMQ_CPP17
#ifdef __has_include
#if __has_include(<optional>)
#include <optional>
#define ZMQ_HAS_OPTIONAL 1
#endif
#if __has_include(<string_view>)
#include <string_view>
#define ZMQ_HAS_STRING_VIEW 1
#endif
#endif
#endif
/* Version macros for compile-time API version detection */
@ -127,12 +137,17 @@
#if defined(ZMQ_CPP11) && !defined(__llvm__) && !defined(__INTEL_COMPILER) \
&& defined(__GNUC__) && __GNUC__ < 5
#define ZMQ_CPP11_PARTIAL
#elif defined(__GLIBCXX__) && __GLIBCXX__ < 20160805
//the date here is the last date of gcc 4.9.4, which
// effectively means libstdc++ from gcc 5.5 and higher won't trigger this branch
#define ZMQ_CPP11_PARTIAL
#endif
#ifdef ZMQ_CPP11
#ifdef ZMQ_CPP11_PARTIAL
#define ZMQ_IS_TRIVIALLY_COPYABLE(T) __has_trivial_copy(T)
#else
#include <type_traits>
#define ZMQ_IS_TRIVIALLY_COPYABLE(T) std::is_trivially_copyable<T>::value
#endif
#endif
@ -700,7 +715,7 @@ struct recv_buffer_size
namespace detail
{
#ifdef ZMQ_CPP17
#if defined(ZMQ_HAS_OPTIONAL) && (ZMQ_HAS_OPTIONAL > 0)
using send_result_t = std::optional<size_t>;
using recv_result_t = std::optional<size_t>;
using recv_buffer_result_t = std::optional<recv_buffer_size>;
@ -1097,7 +1112,7 @@ const_buffer buffer(const std::basic_string<T, Traits, Allocator> &data,
return detail::buffer_contiguous_sequence(data, n_bytes);
}
#ifdef ZMQ_CPP17
#if defined(ZMQ_HAS_STRING_VIEW) && (ZMQ_HAS_STRING_VIEW > 0)
// std::basic_string_view
template<class T, class Traits>
const_buffer buffer(std::basic_string_view<T, Traits> data) noexcept
@ -1121,7 +1136,7 @@ constexpr const_buffer str_buffer(const Char (&data)[N]) noexcept
#ifdef ZMQ_CPP14
assert(data[N - 1] == Char{0});
#endif
return const_buffer(static_cast<const Char*>(data),
return const_buffer(static_cast<const Char*>(data),
(N - 1) * sizeof(Char));
}