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/usr/include/boost/beast/core/detail

Name	Size	Mode	Actions
impl/	-	0755	rm
allocator.hpp	945	0644	edit dl rm
async_base.hpp	901	0644	edit dl rm
base64.hpp	1942	0644	edit dl rm
base64.ipp	6170	0644	edit dl rm
bind_continuation.hpp	3504	0644	edit dl rm
bind_default_executor.hpp	3243	0644	edit dl rm
bind_handler.hpp	10959	0644	edit dl rm
buffer.hpp	1825	0644	edit dl rm
buffers_pair.hpp	2636	0644	edit dl rm
buffers_range_adaptor.hpp	2651	0644	edit dl rm
buffers_ref.hpp	1648	0644	edit dl rm
buffer_traits.hpp	2095	0644	edit dl rm
chacha.hpp	4167	0644	edit dl rm
char_buffer.hpp	1407	0644	edit dl rm
clamp.hpp	1229	0644	edit dl rm
config.hpp	2884	0644	edit dl rm
cpu_info.hpp	1787	0644	edit dl rm
flat_stream.hpp	1919	0644	edit dl rm
get_io_context.hpp	2338	0644	edit dl rm
is_invocable.hpp	1888	0644	edit dl rm
ostream.hpp	7004	0644	edit dl rm
pcg.hpp	1464	0644	edit dl rm
read.hpp	9217	0644	edit dl rm
remap_post_to_defer.hpp	2152	0644	edit dl rm
service_base.hpp	850	0644	edit dl rm
sha1.hpp	1624	0644	edit dl rm
sha1.ipp	7998	0644	edit dl rm
static_const.hpp	1154	0644	edit dl rm
static_ostream.hpp	3030	0644	edit dl rm
static_string.hpp	3030	0644	edit dl rm
stream_base.hpp	2685	0644	edit dl rm
stream_traits.hpp	2796	0644	edit dl rm
string.hpp	898	0644	edit dl rm
temporary_buffer.hpp	1611	0644	edit dl rm
tuple.hpp	2194	0644	edit dl rm
type_traits.hpp	2779	0644	edit dl rm
variant.hpp	4889	0644	edit dl rm
varint.hpp	1712	0644	edit dl rm
win32_unicode_path.hpp	2148	0644	edit dl rm
work_guard.hpp	1851	0644	edit dl rm

Edit: /usr/include/boost/beast/core/detail/variant.hpp (4889B)

//
// Copyright (c) 2016-2019 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)
//
// Official repository: https://github.com/boostorg/beast
//

#ifndef BOOST_BEAST_DETAIL_VARIANT_HPP
#define BOOST_BEAST_DETAIL_VARIANT_HPP

#include <boost/beast/core/detail/type_traits.hpp>
#include <boost/assert.hpp>
#include <boost/mp11/algorithm.hpp>

namespace boost {
namespace beast {
namespace detail {

// This simple variant gets the job done without
// causing too much trouble with template depth:
//
// * Always allows an empty state I==0
// * emplace() and get() support 1-based indexes only
// * Basic exception guarantee
// * Max 255 types
//
template<class... TN>
class variant
{
    detail::aligned_union_t<1, TN...> buf_;
    unsigned char i_ = 0;

struct destroy
    {
        variant& self;

void operator()(mp11::mp_size_t<0>)
        {
        }

template<class I>
        void operator()(I) noexcept
        {
            using T =
                mp11::mp_at_c<variant, I::value - 1>;
            detail::launder_cast<T*>(&self.buf_)->~T();
        }
    };

struct copy
    {
        variant& self;
        variant const& other;

void operator()(mp11::mp_size_t<0>)
        {
        }

template<class I>
        void operator()(I)
        {
            using T =
                mp11::mp_at_c<variant, I::value - 1>;
            ::new(&self.buf_) T(
                *detail::launder_cast<T const*>(&other.buf_));
            self.i_ = I::value;
        }
    };

struct move
    {
        variant& self;
        variant& other;

void operator()(mp11::mp_size_t<0>)
        {
        }

template<class I>
        void operator()(I)
        {
            using T =
                mp11::mp_at_c<variant, I::value - 1>;
            ::new(&self.buf_) T(std::move(
                *detail::launder_cast<T*>(&other.buf_)));
            detail::launder_cast<T*>(&other.buf_)->~T();
            self.i_ = I::value;
        }
    };

struct equals
    {
        variant const& self;
        variant const& other;

bool operator()(mp11::mp_size_t<0>)
        {
            return true;
        }

template<class I>
        bool operator()(I)
        {
            using T =
                mp11::mp_at_c<variant, I::value - 1>;
            return
                *detail::launder_cast<T const*>(&self.buf_) ==
                *detail::launder_cast<T const*>(&other.buf_);
        }
    };

void destruct()
    {
        mp11::mp_with_index<
            sizeof...(TN) + 1>(
                i_, destroy{*this});
        i_ = 0;
    }

void copy_construct(variant const& other)
    {
        mp11::mp_with_index<
            sizeof...(TN) + 1>(
                other.i_, copy{*this, other});
    }

void move_construct(variant& other)
    {
        mp11::mp_with_index<
            sizeof...(TN) + 1>(
                other.i_, move{*this, other});
        other.i_ = 0;
    }

public:
    variant() = default;

~variant()
    {
        destruct();
    }

bool
    operator==(variant const& other) const
    {
        if(i_ != other.i_)
            return false;
        return mp11::mp_with_index<
            sizeof...(TN) + 1>(
                i_, equals{*this, other});
    }

// 0 = empty
    unsigned char
    index() const
    {
        return i_;
    }

// moved-from object becomes empty
    variant(variant&& other) noexcept
    {
        move_construct(other);
    }

variant(variant const& other)
    {
        copy_construct(other);
    }

// moved-from object becomes empty
    variant& operator=(variant&& other)
    {
        if(this != &other)
        {
            destruct();
            move_construct(other);
        }
        return *this;
    }

variant& operator=(variant const& other)
    {
        if(this != &other)
        {
            destruct();
            copy_construct(other);

}
        return *this;
    }

template<std::size_t I, class... Args>
    void
    emplace(Args&&... args) noexcept
    {
        destruct();
        ::new(&buf_) mp11::mp_at_c<variant, I - 1>(
            std::forward<Args>(args)...);
        i_ = I;
    }

template<std::size_t I>
    mp11::mp_at_c<variant, I - 1>&
    get()
    {
        BOOST_ASSERT(i_ == I);
        return *detail::launder_cast<
            mp11::mp_at_c<variant, I - 1>*>(&buf_);
    }

template<std::size_t I>
    mp11::mp_at_c<variant, I - 1> const&
    get() const
    {
        BOOST_ASSERT(i_ == I);
        return *detail::launder_cast<
            mp11::mp_at_c<variant, I - 1> const*>(&buf_);
    }

void
    reset()
    {
        destruct();
    }
};

} // detail
} // beast
} // boost

#endif

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