flushable_sink.hpp

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/*
 * Copyright 2015, alex at staticlibs.net
 *
 * 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.
 */

/* 
 * File:   flushable_sink.hpp
 * Author: alex
 *
 * Created on October 13, 2015, 7:53 AM
 */

#ifndef STATICLIB_IO_FLUSHABLE_SINK_HPP
#define STATICLIB_IO_FLUSHABLE_SINK_HPP

#include <ios>

#include "staticlib/config.hpp"

#include "staticlib/io/reference_sink.hpp"
#include "staticlib/io/span.hpp"

namespace staticlib {
namespace io {

template<typename NonFlushableSink>
class flushable_sink {
    NonFlushableSink sink;

public:
    explicit flushable_sink(NonFlushableSink&& sink) :
    sink(std::move(sink)) { }

    flushable_sink(const flushable_sink&) = delete;

    flushable_sink& operator=(const flushable_sink&) = delete;

    flushable_sink(flushable_sink&& other) STATICLIB_NOEXCEPT :
    sink(std::move(other.sink)) { }

    flushable_sink& operator=(flushable_sink&& other) STATICLIB_NOEXCEPT {
        sink = std::move(other.sink);
        return *this;
    }

    std::streamsize write(span<const char> span) {
        return sink.write(span);
    }

    std::streamsize flush() {
        return 0;
    }

    NonFlushableSink& get_sink() {
        return sink;
    }

};

template <typename NonFlushableSink,
        class = typename std::enable_if<!std::is_lvalue_reference<NonFlushableSink>::value>::type>
flushable_sink<NonFlushableSink> make_flushable_sink(NonFlushableSink&& sink) {
    return flushable_sink<NonFlushableSink>(std::move(sink));
}

template <typename NonFlushableSink>
flushable_sink<reference_sink<NonFlushableSink>> make_flushable_sink(NonFlushableSink& sink) {
    return flushable_sink<reference_sink<NonFlushableSink>>(make_reference_sink(sink));
}

} // namespace
}

#endif /* STATICLIB_IO_FLUSHABLE_SINK_HPP */