forked from boostorg/beast
Vinnie Falco
4104eca1f1
websocket:
* Move echo server to test/
* Fix warnings
* Fix maskgen being uncopyable
* Simplify utf8_checker special member declarations
* Fix stream move assignable when owning the next layer
* Add javadocs for stream special members
* Add stream unit tests
* Move throwing member definitions to the .ipp file
* Use get_lowest_layer in stream declaration
* Perform type checks at each call site instead of constructor
* Demote close_code to a non-class enum:
Otherwise, application specific close codes
cannot be assigned without using static_cast.
core:
* Add streambuf_readstream special members tests
* Add move assignment operator to streambuf_readstream
* Add detail/get_lowest_layer trait
* Add static_string tests
* Move static_string from websocket to core
54 lines
1.1 KiB
C++
54 lines
1.1 KiB
C++
//
|
|
// Copyright (c) 2013-2016 Vinnie Falco (vinnie dot falco at gmail dot com)
|
|
//
|
|
// Distributed under the Boost Software License, Version 1.0. (See accompanying
|
|
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
|
|
//
|
|
|
|
#ifndef BEAST_DETAIL_GET_LOWEST_LAYER_HPP
|
|
#define BEAST_DETAIL_GET_LOWEST_LAYER_HPP
|
|
|
|
#include <type_traits>
|
|
|
|
namespace beast {
|
|
namespace detail {
|
|
|
|
template<class T>
|
|
class has_lowest_layer
|
|
{
|
|
template<class U, class R =
|
|
typename U::lowest_layer_type>
|
|
static std::true_type check(int);
|
|
template<class>
|
|
static std::false_type check(...);
|
|
using type = decltype(check<T>(0));
|
|
public:
|
|
static bool constexpr value = type::value;
|
|
};
|
|
|
|
template<class T, bool B>
|
|
struct maybe_get_lowest_layer
|
|
{
|
|
using type = T;
|
|
};
|
|
|
|
template<class T>
|
|
struct maybe_get_lowest_layer<T, true>
|
|
{
|
|
using type = typename T::lowest_layer_type;
|
|
};
|
|
|
|
// If T has a nested type lowest_layer_type,
|
|
// returns that, else returns T.
|
|
template<class T>
|
|
struct get_lowest_layer
|
|
{
|
|
using type = typename maybe_get_lowest_layer<T,
|
|
has_lowest_layer<T>::value>::type;
|
|
};
|
|
|
|
} // detail
|
|
} // beast
|
|
|
|
#endif
|