argument.h

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/************************************************************************************
*                                                                                   *
*   Copyright (c) 2014 Axel Menzel <info@axelmenzel.de>                             *
*                                                                                   *
*   This file is part of RTTR (Run Time Type Reflection)                            *
*   License: MIT License                                                            *
*                                                                                   *
*   Permission is hereby granted, free of charge, to any person obtaining           *
*   a copy of this software and associated documentation files (the "Software"),    *
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*   Software is furnished to do so, subject to the following conditions:            *
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*   The above copyright notice and this permission notice shall be included in      *
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#ifndef __RTTR_ARGUMENT_H__
#define __RTTR_ARGUMENT_H__

#include "rttr/base/core_prerequisites.h"
#include "rttr/detail/misc_type_traits.h"
#include "rttr/type.h"
#include "rttr/variant.h"
#include "rttr/variant_array.h"

#include <type_traits>
#include <utility>

namespace rttr
{
namespace detail
{
class instance;

class argument
{
public:
    argument() : _data(nullptr), _type(impl::get_invalid_type()) {}
    argument(const argument& other) : _data(other._data), _type(other._type) {}
    argument(variant& var) : _data(var.get_ptr()), _type(var.get_type()) {}
    argument(const variant& var) : _data(var.get_ptr()), _type(var.get_type()) {}
    argument(variant_array& var) : _data(var.get_ptr()), _type(var.get_type()) {}
    argument(const variant_array& var) : _data(var.get_ptr()), _type(var.get_type()) {}

    template<typename T>
    argument(const T& data, typename std::enable_if<!std::is_same<argument, T>::value >::type* = 0) 
    :   _data(reinterpret_cast<const void*>(std::addressof(data))),
        _type(rttr::type::get<T>())
    {
        static_assert(!std::is_same<instance, T>::value, "Don't use the argument class for forwarding an instance!");
    }

    template<typename T>
    argument(T& data, typename std::enable_if<!std::is_same<argument, T>::value >::type* = 0) 
    :   _data(reinterpret_cast<const void*>(std::addressof(data))),
        _type(rttr::type::get<T>())
    {
        static_assert(!std::is_same<instance, T>::value, "Don't use the argument class for forwarding an instance!");
    }

    template<typename T>
    bool is_type()  const { return rttr::type::get<T>() == _type; }
    type get_type() const { return _type; }
    void* get_ptr() const { return const_cast<void *>(_data); }

    template<typename T>
    T& get_value() const
    {
        using raw_type = typename std::remove_reference<T>::type;
        return (*reinterpret_cast<raw_type*>(const_cast<void *>(_data)));
    }

    argument& operator=(const argument& other)
    {
        _data = other._data;
        const_cast<rttr::type&>(_type) = other._type;
        return *this;
    }

private:
    const void*         _data;
    const rttr::type    _type;
};

} // end namespace detail
} // end namespace rttr

#endif // __RTTR_ARGUMENT_H__