sol2/sol/proxy.hpp

// The MIT License (MIT)

// Copyright (c) 2013 Danny Y., Rapptz

// Permission is hereby granted, free of charge, to any person obtaining a copy of
// this software and associated documentation files (the "Software"), to deal in
// the Software without restriction, including without limitation the rights to
// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
// the Software, and to permit persons to whom the Software is furnished to do so,
// subject to the following conditions:

// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.

// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
// FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
// COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
// IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
// CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

#ifndef SOL_PROXY_HPP
#define SOL_PROXY_HPP

#include "traits.hpp"
#include "object.hpp"
#include "function.hpp"

namespace sol {
template<typename Table, typename Key>
struct proxy {
private:
    Table& tbl;
    Key& key;

public:

    template<typename T>
    proxy(Table& table, T&& key) : tbl(table), key(std::forward<T>(key)) {}

    template<typename T>
    T get() const {
        return tbl.template get<T>(key);
    }

    template<typename T>
    proxy& set(T&& item) {
        tbl.set(key, std::forward<T>(item));
        return *this;
    }

    template<typename... Args>
    proxy& set_function(Args&&... args) {
        tbl.set_function(key, std::forward<Args>(args)...);
        return *this;
    }

    template<typename U, EnableIf<Function<Unqualified<U>>> = 0>
    void operator=(U&& other) {
        tbl.set_function(key, std::forward<U>(other));
    }

    template<typename U, DisableIf<Function<Unqualified<U>>> = 0>
    void operator=(U&& other) {
        tbl.set(key, std::forward<U>(other));
    }

    operator nil_t() const {
        return get<nil_t>();
    }

    operator object() const {
        return get<object>();
    }

    operator function() const {
        return get<function>();
    }

    operator Unqualified<Table>() const {
        return get<Unqualified<Table>>();
    }

    operator std::string() const {
        return get<std::string>();
    }

    template<typename T = void>
    operator bool() const {
        return get<bool>();
    }

    template<typename T = void>
    operator double() const {
        return get<double>();
    }

    template<typename T = void>
    operator float() const {
        return get<float>();
    }

    template<typename T = void>
    operator int() const {
        return get<int>();
    }

    template<typename... Ret, typename... Args>
    typename return_type<Ret...>::type call(Args&&... args) {
        return tbl.template get<function>(key)(types<Ret...>(), std::forward<Args>(args)...);
    }
};

template<typename Table, typename Key, typename T>
inline bool operator==(T&& left, const proxy<Table, Key>& right) {
    return left == right.template get<Decay<T>>();
}

template<typename Table, typename Key, typename T>
inline bool operator==(const proxy<Table, Key>& right, T&& left) {
    return right.template get<Decay<T>>() == left;
}

template<typename Table, typename Key, typename T>
inline bool operator!=(T&& left, const proxy<Table, Key>& right) {
    return right.template get<Decay<T>>() != left;
}

template<typename Table, typename Key, typename T>
inline bool operator!=(const proxy<Table, Key>& right, T&& left) {
    return right.template get<Decay<T>>() != left;
}
} // sol

#endif // SOL_PROXY_HPP