190 lines
7.0 KiB
C++
190 lines
7.0 KiB
C++
/* ========================================================================= *
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* *
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* OpenMesh *
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* Copyright (c) 2001-2019, RWTH-Aachen University *
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* Department of Computer Graphics and Multimedia *
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* All rights reserved. *
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* www.openmesh.org *
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* *
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*---------------------------------------------------------------------------*
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* This file is part of OpenMesh. *
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*---------------------------------------------------------------------------*
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* *
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* Redistribution and use in source and binary forms, with or without *
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* modification, are permitted provided that the following conditions *
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* are met: *
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* *
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* 1. Redistributions of source code must retain the above copyright notice, *
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* this list of conditions and the following disclaimer. *
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* *
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* 2. Redistributions in binary form must reproduce the above copyright *
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* notice, this list of conditions and the following disclaimer in the *
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* documentation and/or other materials provided with the distribution. *
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* *
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* 3. Neither the name of the copyright holder nor the names of its *
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* contributors may be used to endorse or promote products derived from *
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* this software without specific prior written permission. *
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* *
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS *
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED *
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A *
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* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER *
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* OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, *
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, *
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR *
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF *
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING *
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS *
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. *
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* *
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* ========================================================================= */
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#pragma once
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#include <utility>
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#include <array>
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#include <vector>
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//== NAMESPACES ===============================================================
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namespace OpenMesh {
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//== FORWARD DECLARATION ======================================================
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//== CLASS DEFINITION =========================================================
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namespace {
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struct Identity
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{
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template <typename T>
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T operator()(const T& _t) const { return _t; }
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};
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}
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/// Base class for all smart range types
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template <typename RangeT, typename HandleT>
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struct SmartRangeT
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{
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// TODO: Someone with better c++ knowledge may improve the code below.
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template <typename Functor>
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auto sum(Functor&& f) -> decltype (f(std::declval<HandleT>())+f(std::declval<HandleT>()))
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{
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auto range = static_cast<const RangeT*>(this);
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auto begin = range->begin();
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auto end = range->end();
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assert(begin != end);
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decltype (f(*begin) + f(*begin)) sum = f(*begin);
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auto it = begin;
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++it;
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for (; it != end; ++it)
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sum += f(*it);
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return sum;
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}
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template <typename Functor>
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auto avg(Functor&& f) -> decltype (1.0 * (f(std::declval<HandleT>())+f(std::declval<HandleT>())))
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{
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auto range = static_cast<const RangeT*>(this);
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auto begin = range->begin();
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auto end = range->end();
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assert(begin != end);
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decltype (f(*begin) + f(*begin)) sum = f(*begin);
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auto it = begin;
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++it;
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int n_elements = 1;
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for (; it != end; ++it)
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{
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sum += f(*it);
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++n_elements;
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}
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return (1.0 / n_elements) * sum;
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}
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template <int n, typename Functor = Identity>
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auto to_array(Functor&& f = {}) -> std::array<typename std::remove_reference<decltype (f(std::declval<HandleT>()))>::type, n>
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{
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auto range = static_cast<const RangeT*>(this);
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std::array<typename std::remove_reference<decltype (f(std::declval<HandleT>()))>::type, n> res;
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auto it = range->begin();
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auto end = range->end();
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int i = 0;
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while (i < n && it != end)
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res[i++] = f(*(it++));
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return res;
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}
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template <typename Functor = Identity>
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auto to_vector(Functor&& f = {}) -> std::vector<typename std::remove_reference<decltype (f(std::declval<HandleT>()))>::type>
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{
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auto range = static_cast<const RangeT*>(this);
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std::vector<typename std::remove_reference<decltype (f(std::declval<HandleT>()))>::type> res;
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for (auto e : *range)
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res.push_back(f(e));
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return res;
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}
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template <typename Functor>
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auto min(Functor&& f) -> typename std::remove_reference<decltype (f(std::declval<HandleT>()))>::type
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{
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using std::min;
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auto range = static_cast<const RangeT*>(this);
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auto it = range->begin();
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auto end = range->end();
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assert(it != end);
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typename std::remove_reference<decltype (f(std::declval<HandleT>()))>::type res = f(*it);
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++it;
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for (; it != end; ++it)
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res = min(res, f(*it));
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return res;
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}
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template <typename Functor>
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auto max(Functor&& f) -> typename std::remove_reference<decltype (f(std::declval<HandleT>()))>::type
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{
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using std::max;
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auto range = static_cast<const RangeT*>(this);
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auto it = range->begin();
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auto end = range->end();
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assert(it != end);
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typename std::remove_reference<decltype (f(std::declval<HandleT>()))>::type res = f(*it);
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++it;
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for (; it != end; ++it)
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res = max(res, f(*it));
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return res;
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}
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template <typename Functor>
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auto minmax(Functor&& f) -> std::pair<typename std::remove_reference<decltype (f(std::declval<HandleT>()))>::type,
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typename std::remove_reference<decltype (f(std::declval<HandleT>()))>::type>
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{
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return std::make_pair(this->min(f), this->max(f));
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}
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};
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//=============================================================================
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} // namespace OpenMesh
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//=============================================================================
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//=============================================================================
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