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Add is_mutable_body_writer metafunction

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Vinnie Falco
2018-05-04 19:23:52 -07:00
parent 416f84bc63
commit 07aead170a
3 changed files with 39 additions and 0 deletions
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1
CHANGELOG.md
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@ -8,6 +8,7 @@ Version 170:
* Use a shared string for example HTTP server doc roots
* Remove deprecated serializer::reader_impl()
* Remove deprecated Body reader and writer ctor signatures
* Add is_mutable_body_writer metafunction
--------------------------------------------------------------------------------

1
doc/qbk/quickref.xml
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@ -114,6 +114,7 @@
<member><link linkend="beast.ref.boost__beast__http__is_body_reader">is_body_reader</link></member>
<member><link linkend="beast.ref.boost__beast__http__is_body_writer">is_body_writer</link></member>
<member><link linkend="beast.ref.boost__beast__http__is_fields">is_fields</link></member>
<member><link linkend="beast.ref.boost__beast__http__is_mutable_body_writer">is_mutable_body_writer</link></member>
</simplelist>
<bridgehead renderas="sect3">Concepts</bridgehead>
<simplelist type="vert" columns="1">

37
include/boost/beast/http/type_traits.hpp
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@ -100,6 +100,43 @@ struct is_body_writer<T, beast::detail::void_t<
> {};
#endif
/** Returns true if the writer for a @b Body mutates the body container.
*/
#if BOOST_BEAST_DOXYGEN
template<class T>
struct is_mutable_body_writer : std::integral_constant<bool, ...> {};
#else
template<class T, class = void>
struct is_mutable_body_writer : std::false_type {};
template<class T>
struct is_mutable_body_writer<T, beast::detail::void_t<
typename T::writer,
typename T::writer::const_buffers_type,
decltype(
std::declval<typename T::writer&>().init(std::declval<error_code&>()),
std::declval<boost::optional<std::pair<
typename T::writer::const_buffers_type, bool>>&>() =
std::declval<typename T::writer>().get(std::declval<error_code&>())
)>> : std::integral_constant<bool,
boost::asio::is_const_buffer_sequence<
typename T::writer::const_buffers_type>::value && ((
std::is_constructible<typename T::writer,
header<true, detail::fields_model>&,
typename T::value_type&>::value &&
std::is_constructible<typename T::writer,
header<false, detail::fields_model>&,
typename T::value_type&>::value &&
! std::is_constructible<typename T::writer,
header<true, detail::fields_model> const&,
typename T::value_type const&>::value &&
! std::is_constructible<typename T::writer,
header<false, detail::fields_model> const&,
typename T::value_type const&>::value
))
>{};
#endif
/** Determine if a @b Body type has a reader.
This metafunction is equivalent to `std::true_type` if: