mirror of
https://github.com/ThePhD/sol2.git
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126 lines
4.8 KiB
C++
126 lines
4.8 KiB
C++
// The MIT License (MIT)
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// Copyright (c) 2013-2016 Rapptz, ThePhD and contributors
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// Permission is hereby granted, free of charge, to any person obtaining a copy of
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// this software and associated documentation files (the "Software"), to deal in
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// the Software without restriction, including without limitation the rights to
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// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
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// the Software, and to permit persons to whom the Software is furnished to do so,
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// subject to the following conditions:
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// The above copyright notice and this permission notice shall be included in all
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// copies or substantial portions of the Software.
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
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// FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
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// COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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// IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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// CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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#ifndef SOL_FUNCTION_HPP
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#define SOL_FUNCTION_HPP
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#include "reference.hpp"
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#include "stack.hpp"
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#include "resolve.hpp"
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#include "function_result.hpp"
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#include "function_types.hpp"
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#include <cstdint>
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#include <functional>
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#include <memory>
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namespace sol {
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class function : public reference {
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private:
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void luacall( std::ptrdiff_t argcount, std::ptrdiff_t resultcount ) const {
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lua_callk( lua_state( ), static_cast<int>( argcount ), static_cast<int>( resultcount ), 0, nullptr );
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}
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template<std::size_t... I, typename... Ret>
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auto invoke( types<Ret...>, std::index_sequence<I...>, std::ptrdiff_t n ) const {
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luacall( n, sizeof...( Ret ) );
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return stack::pop<std::tuple<Ret...>>( lua_state( ) );
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}
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template<std::size_t I, typename Ret>
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Ret invoke(types<Ret>, std::index_sequence<I>, std::ptrdiff_t n ) const {
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luacall( n, 1 );
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return stack::pop<Ret>( lua_state( ) );
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}
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template <std::size_t I>
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void invoke(types<void>, std::index_sequence<I>, std::ptrdiff_t n) const {
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luacall( n, 0 );
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}
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function_result invoke(types<>, std::index_sequence<>, std::ptrdiff_t n ) const {
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int stacksize = lua_gettop( lua_state( ) );
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int firstreturn = std::max( 1, stacksize - static_cast<int>( n ) );
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luacall(n, LUA_MULTRET);
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int poststacksize = lua_gettop( lua_state( ) );
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int returncount = poststacksize - (firstreturn - 1);
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return function_result( lua_state( ), firstreturn, returncount );
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}
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public:
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using reference::reference;
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template<typename... Args>
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function_result operator()( Args&&... args ) const {
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return call<>( std::forward<Args>( args )... );
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}
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template<typename... Ret, typename... Args>
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decltype(auto) operator()( types<Ret...>, Args&&... args ) const {
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return call<Ret...>( std::forward<Args>( args )... );
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}
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template<typename... Ret, typename... Args>
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decltype(auto) call( Args&&... args ) const {
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push( );
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int pushcount = stack::multi_push( lua_state( ), std::forward<Args>( args )... );
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return invoke( types<Ret...>( ), std::make_index_sequence<sizeof...(Ret)>(), pushcount );
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}
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};
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namespace stack {
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template<typename Signature>
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struct getter<std::function<Signature>> {
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typedef meta::bind_traits<Signature> fx_t;
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typedef typename fx_t::args_type args_types;
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typedef meta::tuple_types<typename fx_t::return_type> return_types;
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template<typename... Args, typename... Ret>
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static std::function<Signature> get_std_func(types<Ret...>, types<Args...>, lua_State* L, int index = -1) {
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sol::function f(L, index);
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auto fx = [f, L, index](Args&&... args) -> meta::return_type_t<Ret...> {
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return f.call<Ret...>(std::forward<Args>(args)...);
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};
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return std::move(fx);
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}
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template<typename... FxArgs>
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static std::function<Signature> get_std_func(types<void>, types<FxArgs...>, lua_State* L, int index = -1) {
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sol::function f(L, index);
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auto fx = [f, L, index](FxArgs&&... args) -> void {
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f(std::forward<FxArgs>(args)...);
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};
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return std::move(fx);
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}
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template<typename... FxArgs>
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static std::function<Signature> get_std_func(types<>, types<FxArgs...> t, lua_State* L, int index = -1) {
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return get_std_func(types<void>(), t, L, index);
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}
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static std::function<Signature> get(lua_State* L, int index) {
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return get_std_func(return_types(), args_types(), L, index);
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}
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};
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} // stack
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} // sol
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#endif // SOL_FUNCTION_HPP
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