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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_KIND_HPP
#define BOOST_JSON_KIND_HPP
#include <boost/json/detail/config.hpp>
#include <boost/json/string_view.hpp>
#include <iosfwd>
BOOST_JSON_NS_BEGIN
/** Constants for identifying the type of a value
These values are returned from @ref value::kind
*/
// Order matters
enum class kind : unsigned char
{
/// The null value.
null,
/// A `bool`.
bool_,
/// A `std::int64_t`
int64,
/// A `std::uint64_t`
uint64,
/// A `double`.
double_,
/// A @ref string.
string,
/// An @ref array.
array,
/// An @ref object.
object
};
/** Return a string representing a kind.
This provides a human-readable string
representing a @ref kind. This may be
useful for diagnostics.
@returns The string.
@param k The kind.
*/
BOOST_JSON_DECL
string_view
to_string(kind k) noexcept;
/** Format a kind to an output stream.
This allows a @ref kind to be formatted as
a string, typically for diagnostics.
@returns The output stream.
@param os The output stream to format to.
@param k The kind to format.
*/
BOOST_JSON_DECL
std::ostream&
operator<<(std::ostream& os, kind k);
/** A tag type used to select a @ref value constructor overload.
The library provides the constant @ref array_kind
which may be used to select the @ref value constructor
that creates an empty @ref array.
@see @ref array_kind
*/
struct array_kind_t
{
};
/** A tag type used to select a @ref value constructor overload.
The library provides the constant @ref object_kind
which may be used to select the @ref value constructor
that creates an empty @ref object.
@see @ref object_kind
*/
struct object_kind_t
{
};
/** A tag type used to select a @ref value constructor overload.
The library provides the constant @ref string_kind
which may be used to select the @ref value constructor
that creates an empty @ref string.
@see @ref string_kind
*/
struct string_kind_t
{
};
/** A constant used to select a @ref value constructor overload.
The library provides this constant to allow efficient
construction of a @ref value containing an empty @ref array.
@par Example
@code
storage_ptr sp;
value jv( array_kind, sp ); // sp is an optional parameter
@endcode
@see @ref array_kind_t
*/
BOOST_JSON_INLINE_VARIABLE(array_kind, array_kind_t);
/** A constant used to select a @ref value constructor overload.
The library provides this constant to allow efficient
construction of a @ref value containing an empty @ref object.
@par Example
@code
storage_ptr sp;
value jv( object_kind, sp ); // sp is an optional parameter
@endcode
@see @ref object_kind_t
*/
BOOST_JSON_INLINE_VARIABLE(object_kind, object_kind_t);
/** A constant used to select a @ref value constructor overload.
The library provides this constant to allow efficient
construction of a @ref value containing an empty @ref string.
@par Example
@code
storage_ptr sp;
value jv( string_kind, sp ); // sp is an optional parameter
@endcode
@see @ref string_kind_t
*/
BOOST_JSON_INLINE_VARIABLE(string_kind, string_kind_t);
BOOST_JSON_NS_END
#endif
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