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construct/include/ircd/json/property.h

72 lines
1.8 KiB
C++

/*
* Copyright (C) 2017 Charybdis Development Team
* Copyright (C) 2017 Jason Volk <jason@zemos.net>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice is present in all copies.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#define HAVE_IRCD_JSON_PROPERTY_H
namespace ircd::json
{
template<const char *const &name, class value_type> struct property;
}
/// The property template specifies a key/value member of a json::tuple
///
///
template<const char *const &name,
class T>
struct ircd::json::property
{
using key_type = const char *const &;
using value_type = T;
static constexpr auto &key
{
name
};
T value;
operator const T &() const;
operator T &();
property(T&& value)
:value{value}
{}
property() = default;
};
template<const char *const &name,
class T>
ircd::json::property<name, T>::operator
T &()
{
return value;
}
template<const char *const &name,
class T>
ircd::json::property<name, T>::operator
const T &()
const
{
return value;
}