63e88f80
 Hu Chunming
提交三方库
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//
// 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_VISIT_HPP
#define BOOST_JSON_VISIT_HPP
#include <boost/json/detail/config.hpp>
#include <boost/json/value.hpp>
#include <type_traits>
#include <utility>
BOOST_JSON_NS_BEGIN
/** Invoke a function object with the contents of a @ref value
@return The value returned by Visitor.
@param v The visitation function to invoke
@param jv The value to visit.
*/
/** @{ */
template<class Visitor>
auto
visit(
Visitor&& v,
value& jv) -> decltype(
std::declval<Visitor>()(nullptr));
template<class Visitor>
auto
visit(
Visitor &&v,
value const &jv) -> decltype(
std::declval<Visitor>()(nullptr));
/** @} */
BOOST_JSON_NS_END
#include <boost/json/impl/visit.hpp>
#endif
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