kopia lustrzana https://github.com/vsamy/DiFipp
57 wiersze
2.2 KiB
C++
57 wiersze
2.2 KiB
C++
// Copyright (c) 2019, Vincent SAMY
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// All rights reserved.
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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 are met:
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * 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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// * Neither the name of the AIST nor the
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// names of its contributors may be used to endorse or promote products
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// derived from this software without specific prior written permission.
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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// DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
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// DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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// ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING 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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#pragma once
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#include <complex>
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namespace difi {
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namespace internal {
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// Based on https://stackoverflow.com/a/41449096/9774052
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template <typename T>
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std::true_type is_tt_impl(std::complex<T>);
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std::false_type is_tt_impl(...);
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template <typename T>
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using is_complex = decltype(is_tt_impl(std::declval<T>()));
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template <typename T, bool B>
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struct sub_type {
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using type = T;
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};
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template <typename T>
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struct sub_type<T, true> {
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using type = typename T::value_type;
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};
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template <typename T>
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using complex_sub_type_t = typename sub_type<T, is_complex<T>::value>::type;
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} // namespace internal
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} // namespace difi
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