libcruft-util/json/constraint/length.hpp

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/*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* Copyright 2018 Danny Robson <danny@nerdcruft.net>
*/
#pragma once
#include "base.hpp"
#include <functional>
///////////////////////////////////////////////////////////////////////////////
namespace util::json::schema::constraint {
template <typename ComparatorT>
class length final : public base {
public:
length (::json::tree::node const&);
virtual ~length () = default;
output_iterator validate (output_iterator, ::json::tree::node &target) const noexcept override;
std::ostream& describe (std::ostream&) const override;
private:
std::size_t m_length;
};
using max_length = length<std::less_equal<std::size_t>>;
using min_length = length<std::greater_equal<std::size_t>>;
}