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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>
namespace boost {
namespace json {
/** Invoke a function object with the contents of a @ref value
Invokes `v` as if by `std::forward<Visitor>(v)( X )`, where `X` is
@li `jv.get_array()` if `jv.is_array()`, or
@li `jv.get_object()` if `jv.is_object()`, or
@li `jv.get_string()` if `jv.is_string()`, or
@li `jv.get_int64()` if `jv.is_int64()`, or
@li `jv.get_uint64()` if `jv.is_uint64()`, or
@li `jv.get_double()` if `jv.is_double()`, or
@li `jv.get_bool()` if `jv.is_bool()`, or
@li reference to an object of type `std::nullptr_t` if `jv.is_null()`.
@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(
static_cast<Visitor&&>(v)( std::declval<std::nullptr_t&>() ) );
/** Invoke a function object with the contents of a @ref value
Invokes `v` as if by `std::forward<Visitor>(v)( X )`, where `X` is
@li `jv.get_array()` if `jv.is_array()`, or
@li `jv.get_object()` if `jv.is_object()`, or
@li `jv.get_string()` if `jv.is_string()`, or
@li `jv.get_int64()` if `jv.is_int64()`, or
@li `jv.get_uint64()` if `jv.is_uint64()`, or
@li `jv.get_double()` if `jv.is_double()`, or
@li `jv.get_bool()` if `jv.is_bool()`, or
@li reference to an object of type `const std::nullptr_t` if `jv.is_null()`.
@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 const &jv) -> decltype(
static_cast<Visitor&&>(v)( std::declval<std::nullptr_t const&>() ) );
/** Invoke a function object with the contents of a @ref value
Invokes `v` as if by `std::forward<Visitor>(v)( X )`, where `X` is
@li `std::move( jv.get_array() )` if `jv.is_array()`, or
@li `std::move( jv.get_object() )` if `jv.is_object()`, or
@li `std::move( jv.get_string() )` if `jv.is_string()`, or
@li `std::move( jv.get_int64() )` if `jv.is_int64()`, or
@li `std::move( jv.get_uint64() )` if `jv.is_uint64()`, or
@li `std::move( jv.get_double() )` if `jv.is_double()`, or
@li `std::move( jv.get_bool() )` if `jv.is_bool()`, or
@li `std::nullptr_t()` if `jv.is_null()`.
@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(
static_cast<Visitor&&>(v)( std::declval<std::nullptr_t&&>() ) );
} // namespace json
} // namespace boost
#include <boost/json/impl/visit.hpp>
#endif
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