value.h

/*
 * Copyright (c) 2015, Thomas Keh
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *    1. Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *
 *    2. Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *
 *    3. Neither the name of the copyright holder nor the names of its
 *       contributors may be used to endorse or promote products derived from
 *       this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 COPYRIGHT HOLDER OR CONTRIBUTORS 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

#include <cstdint>
#include <string>
#include <vector>
#include <limits>

#include "utils.h"

namespace kaco {

    struct Value {
        
        // Check real32 / real64 support
        static_assert(std::numeric_limits<float>::is_iec559, "Your machine doesn't use IEEE 754 compliant single-precision floating point numbers.");
        static_assert(sizeof(float)==4, "sizeof(float)!=4 on your machine.");
        static_assert(sizeof(double)==8, "sizeof(double)!=8 on your machine.");

        Type type;

        std::string string;

        std::vector<uint8_t> octet_string;

        union {
            uint8_t uint8;
            uint16_t uint16;
            uint32_t uint32;
            uint64_t uint64;
            int8_t int8;
            int16_t int16;
            int32_t int32;
            int64_t int64;
            float real32;
            double real64;
            bool boolean;
        };
        
        Value();

        Value(uint8_t value);

        Value(uint16_t value);

        Value(uint32_t value);

        Value(uint64_t value);

        Value(int8_t value);

        Value(int16_t value);

        Value(int32_t value);

        Value(int64_t value);

        Value(float value);

        Value(double value);

        Value(bool value);

        Value(const std::string& value);

        Value(const char* value);

        Value(const std::vector<uint8_t>& value);

        Value(Type type_, const std::vector<uint8_t>& data);

        std::vector<uint8_t> get_bytes() const;

        operator uint8_t() const;

        operator uint16_t() const;

        operator uint32_t() const;

        operator uint64_t() const;

        operator int8_t() const;

        operator int16_t() const;

        operator int32_t() const;

        operator int64_t() const;

        operator float() const;

        operator double() const;

        operator bool() const;

        operator std::string() const;

        operator std::vector<uint8_t>() const;

        bool operator==(const Value& other) const;

        bool operator!=(const Value& other) const;

        std::string to_string() const;

    private:

        static const bool debug = false;

    };

    namespace value_printer {
        std::ostream &operator<<(std::ostream &os, Value val);
    }

} // end namespace kaco

// For correct usage of logger.h one should use the int8_printers, so
// the int8_printers namespace is automatically included. Because of
// this, logger.h should not be included in library headers.
using namespace kaco::value_printer;