/** * @file lldepthstack.h * @brief Declaration of the LLDepthStack class * * $LicenseInfo:firstyear=2001&license=viewerlgpl$ * Second Life Viewer Source Code * Copyright (C) 2010, Linden Research, Inc. * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; * version 2.1 of the License only. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA * * Linden Research, Inc., 945 Battery Street, San Francisco, CA 94111 USA * $/LicenseInfo$ */ #ifndef LL_LLDEPTHSTACK_H #define LL_LLDEPTHSTACK_H #include "llstl.h" template <class DATA_TYPE> class LLDepthStack { private: std::deque<DATA_TYPE*> mStack; U32 mCurrentDepth; U32 mMaxDepth; public: LLDepthStack() : mCurrentDepth(0), mMaxDepth(0) {} void setDepth(U32 depth) { mMaxDepth = depth; } U32 getDepth(void) const { return mCurrentDepth; } void push(DATA_TYPE *data) { if (mCurrentDepth < mMaxDepth) { mStack.push_back(data); mCurrentDepth++; } else { // the last item falls off stack and is deleted if (!mStack.empty()) { mStack.pop_front(); } mStack.push_back(data); } } DATA_TYPE *pop() { DATA_TYPE *tempp = NULL; if (!mStack.empty()) { tempp = mStack.back(); mStack.pop_back(); mCurrentDepth--; } return tempp; } DATA_TYPE *check() { return mStack.empty() ? NULL : mStack.back(); } void removeAllNodes() { mCurrentDepth = 0; mStack.clear(); } }; #endif