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https://github.com/PixarAnimationStudios/OpenSubdiv
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aacd43a09b
- also refactor Vtr::Array 'FindIndex' functions
114 lines
4.1 KiB
C++
114 lines
4.1 KiB
C++
//
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// Copyright 2014 DreamWorks Animation LLC.
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//
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// Licensed under the Apache License, Version 2.0 (the "Apache License")
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// with the following modification; you may not use this file except in
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// compliance with the Apache License and the following modification to it:
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// Section 6. Trademarks. is deleted and replaced with:
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//
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// 6. Trademarks. This License does not grant permission to use the trade
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// names, trademarks, service marks, or product names of the Licensor
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// and its affiliates, except as required to comply with Section 4(c) of
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// the License and to reproduce the content of the NOTICE file.
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//
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// You may obtain a copy of the Apache License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the Apache License with the above modification is
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// distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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// KIND, either express or implied. See the Apache License for the specific
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// language governing permissions and limitations under the Apache License.
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//
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#ifndef VTR_ARRAY_INTERFACE_H
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#define VTR_ARRAY_INTERFACE_H
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#include "../version.h"
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#include <cassert>
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namespace OpenSubdiv {
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namespace OPENSUBDIV_VERSION {
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namespace Vtr {
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//
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// This class provides a simple array-like interface -- a subset std::vector's interface -- for
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// a sequence of elements stored in contiguous memory. It provides a unified representation for
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// referencing data on the stack, all or a subset of std::vector<>, or anywhere else in memory.
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//
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// Note that its members are head/size rather than begin/end as in std::vector -- we frequently
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// need only the size for many queries, and that is most often what is stored elsewhere in other
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// classes, so we hope to reduce unnecessary address arithmetic constructing the interface and
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// accessing the size. The size type is also specifically 32-bit (rather than size_t) to match
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// internal usage and avoid unnecessary conversion to/from 64-bit.
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//
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// Question:
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// Naming is at issue here... formerly called ArrayInterface until that was shot down it has
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// been simplified to Array but needs to be distanced from std::array as it DOES NOT store its
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// own memory and is simply an interface to memory stored elsewhere.
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//
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template <typename TYPE>
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class Array {
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public:
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typedef TYPE value_type;
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typedef int size_type;
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typedef TYPE const& const_reference;
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typedef TYPE const* const_iterator;
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typedef TYPE& reference;
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typedef TYPE* iterator;
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public:
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Array() : _begin(0), _size(0) { }
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Array(const Array<value_type>& array) : _begin(array._begin),
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_size(array._size) { }
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Array(const value_type* ptr, size_type size) : _begin(const_cast<value_type*>(ptr)),
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_size(size) { }
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~Array() { }
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size_type size() const { return _size; }
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const_reference operator[](int index) const { return _begin[index]; }
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const_iterator begin() const { return _begin; }
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const_iterator end() const { return _begin + _size; }
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reference operator[](int index) { return _begin[index]; }
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iterator begin() { return _begin; }
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iterator end() { return _begin + _size; }
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size_type FindIndexIn4Tuple(value_type value) const {
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assert(_size>=4);
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if (value == _begin[0]) return 0;
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if (value == _begin[1]) return 1;
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if (value == _begin[2]) return 2;
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if (value == _begin[3]) return 3;
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assert("FindIndexIn4Tuple() did not find expected value!" == 0);
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return -1;
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}
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size_type FindIndex(value_type value) const {
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for (size_type i=0; i<size(); ++i) {
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if (value==_begin[i]) {
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return i;
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}
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}
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return -1;
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}
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protected:
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value_type* _begin;
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size_type _size;
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};
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} // end namespace Vtr
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} // end namespace OPENSUBDIV_VERSION
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using namespace OPENSUBDIV_VERSION;
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} // end namespace OpenSubdiv
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#endif /* VTR_ARRAY_INTERFACE_H */
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