//

// Copyright (c) 2019 Vinnie Falco (vinnie.falco@gmail.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/json

//

#ifndef BOOST_JSON_IMPL_STATIC_RESOURCE_IPP

#define BOOST_JSON_IMPL_STATIC_RESOURCE_IPP

#include <boost/json/static_resource.hpp>

#include <boost/throw_exception.hpp>

#include <memory>

namespace boost {

namespace json {

static_resource::

static_resource(

    unsigned char* buffer,

    std::size_t size) noexcept

    : p_(buffer)

    , n_(size)

    , size_(size)

{

}

void

static_resource::

release() noexcept

{

    p_ = reinterpret_cast<

        char*>(p_) - (size_ - n_);

    n_ = size_;

}

void*

static_resource::

do_allocate(

    std::size_t n,

    std::size_t align)

{

    auto p = std::align(align, n, p_, n_);

    if(! p)

        throw_exception( std::bad_alloc(), BOOST_CURRENT_LOCATION );

    p_ = reinterpret_cast<char*>(p) + n;

    n_ -= n;

    return p;

}

void

static_resource::

do_deallocate(

    void*,

    std::size_t,

    std::size_t)

{

    // do nothing

}

bool

static_resource::

do_is_equal(

    memory_resource const& mr) const noexcept

{

    return this == &mr;

}

} // namespace json

} // namespace boost

#endif