78 lines
2.5 KiB
C++
78 lines
2.5 KiB
C++
/**
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* vim: set ts=4 :
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* =============================================================================
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* SourceMod
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* Copyright (C) 2004-2019 AlliedModders LLC. All rights reserved.
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* =============================================================================
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*
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* This program is free software; you can redistribute it and/or modify it under
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* the terms of the GNU General Public License, version 3.0, as published by the
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* Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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* details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program. If not, see <http://www.gnu.org/licenses/>.
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*
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* As a special exception, AlliedModders LLC gives you permission to link the
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* code of this program (as well as its derivative works) to "Half-Life 2," the
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* "Source Engine," the "SourcePawn JIT," and any Game MODs that run on software
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* by the Valve Corporation. You must obey the GNU General Public License in
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* all respects for all other code used. Additionally, AlliedModders LLC grants
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* this exception to all derivative works. AlliedModders LLC defines further
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* exceptions, found in LICENSE.txt (as of this writing, version JULY-31-2007),
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* or <http://www.sourcemod.net/license.php>.
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*
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* Version: $Id$
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*/
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/**
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* A type-safe abstraction for creating a contiguous blob of memory used for
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* vtable function calls. This blob contains the parameters to be passed into
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* the function call.
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*/
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template <typename T, typename...Rest>
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class ArgBuffer {
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public:
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ArgBuffer(const T& t, const Rest&... rest) {
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unsigned char *ptr = buff;
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buildbuffer(&ptr, t, rest...);
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}
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operator void*() { return buff; }
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operator unsigned char*() { return buff; }
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constexpr int size() const {
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return sizeof(buff);
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}
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private:
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template <typename K>
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constexpr static int sizetypes() {
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return sizeof(K);
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}
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template <typename K, typename K2, typename... Kn>
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constexpr static int sizetypes() {
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return sizeof(K) + sizetypes<K2, Kn...>();
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}
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template <typename K>
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void buildbuffer(unsigned char **ptr, K& k) {
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memcpy(*ptr, &k, sizeof(k));
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*ptr += sizeof(K);
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}
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template <typename K, typename... Kn>
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void buildbuffer(unsigned char **ptr, K& k, Kn&... kn) {
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buildbuffer(ptr, k);
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if (sizeof...(kn)!=0)
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buildbuffer(ptr, kn...);
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}
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private:
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unsigned char buff[sizetypes<T, Rest...>()];
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};
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