Danny Robson
d3f434b523
The coordinate system was unable to support types that prohibited redim or retype operations. Additionally, the `tags' type used for providing named data parameters was unwiedly. We remove much of the dependance on template template parameters in the defined operations and instead define these in terms of a template specialisation of is_coord. The tag types were replaced with direct specialisation of the `store' struct by the primary type, and passing this type through use of the CRTP.
89 lines
2.6 KiB
C++
89 lines
2.6 KiB
C++
/*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the 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 License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* Copyright 2016 Danny Robson <danny@nerdcruft.net>
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*/
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#ifndef __UTIL_RANDOM_HPP
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#define __UTIL_RANDOM_HPP
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#include <algorithm>
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#include <random>
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///////////////////////////////////////////////////////////////////////////////
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namespace util::rand {
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//-------------------------------------------------------------------------
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using default_generator = std::minstd_rand;
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//-------------------------------------------------------------------------
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template <typename Generator = default_generator>
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Generator&
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thread_engine (void)
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{
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std::random_device rd;
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thread_local Generator gen (rd ());
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return gen;
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}
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//-------------------------------------------------------------------------
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template <typename Generator = default_generator, typename T, size_t N>
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T&
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choose (T (&t)[N], Generator gen = thread_engine<Generator> ())
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{
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std::uniform_int_distribution<size_t> dist (0, N-1);
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return t[dist (gen)];
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}
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//-------------------------------------------------------------------------
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template <
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typename T,
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typename IteratorT,
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typename GeneratorT = default_generator
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>
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void
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uniform (T lo, T hi, IteratorT first, IteratorT last)
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{
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static_assert (std::is_same_v<T, typename std::iterator_traits<IteratorT>::value_type>);
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auto &gen = thread_engine<GeneratorT> ();
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static_assert (std::is_integral_v<T> || std::is_floating_point_v<T>);
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if constexpr (std::is_integral_v<T>) {
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std::generate (
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first,
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last,
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[&gen, d = std::uniform_int_distribution<T> (lo, hi)]
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{
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return d (gen);
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});
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}
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if constexpr (std::is_floating_point_v<T>) {
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auto d = std::uniform_real_distribution<T> (lo, hi);
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std::generate (
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first,
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last,
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[&]
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{
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return d (gen);
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});
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}
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}
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};
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#endif
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