simple_variant.hpp

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// simple_variant.hpp
/*
 *  Copyright (c) 2007 Leigh Johnston.
 *
 *  All rights reserved.
 *
 *  Redistribution and use in source and binary forms, with or without
 *  modification, are permitted provided that the following conditions are
 *  met:
 *
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *
 *     * 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.
 *
 *     * Neither the name of Leigh Johnston nor the names of any
 *       other contributors to this software 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 OWNER 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 <neolib/neolib.hpp>
#include <string>
#include <boost/lexical_cast.hpp>
#include <neolib/core/reference_counted.hpp>
#include <neolib/core/string.hpp>
#include <neolib/core/string_numeric.hpp>
#include <neolib/core/i_enum.hpp>
#include <neolib/core/i_custom_type.hpp>
#include <neolib/core/i_simple_variant.hpp>
#include <neolib/plugin/plugin_variant.hpp>
 
namespace neolib
{
    typedef plugin_variant<simple_variant_type, bool, int64_t, double, string, ref_ptr<i_enum>, ref_ptr<i_custom_type>> simple_variant;
 
    inline simple_variant from_string(std::string const& aString, simple_variant_type aType)
    {
        switch (aType)
        {
        case simple_variant_type::Boolean:
            if (aString == "true" || aString == "1")
                return true;
            else
                return false;
        case simple_variant_type::Integer:
            return string_to_int64(aString);
        case simple_variant_type::Real:
            return string_to_double(aString);
        case simple_variant_type::String:
            return aString;
        default:
            throw std::logic_error("neolib: cannot convert string to simple variant");
        }
    }
 
    inline std::string to_string(simple_variant const& aVariant)
    {
        return to_string(static_cast<i_simple_variant const&>(aVariant));
    }
}