162 lines
5.0 KiB
C++
162 lines
5.0 KiB
C++
// SPDX-License-Identifier: Apache-2.0
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//
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// Copyright 2008-2016 Conrad Sanderson (http://conradsanderson.id.au)
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// Copyright 2008-2016 National ICT Australia (NICTA)
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//
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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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// 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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//! \addtogroup upgrade_val
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//! @{
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//! upgrade_val is used to ensure an operation such as multiplication is possible between two types.
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//! values are upgraded only where necessary.
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template<typename T1, typename T2>
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struct upgrade_val
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{
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typedef typename promote_type<T1,T2>::result T1_result;
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typedef typename promote_type<T1,T2>::result T2_result;
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arma_inline
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static
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typename promote_type<T1,T2>::result
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apply(const T1 x)
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{
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typedef typename promote_type<T1,T2>::result out_type;
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return out_type(x);
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}
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arma_inline
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static
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typename promote_type<T1,T2>::result
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apply(const T2 x)
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{
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typedef typename promote_type<T1,T2>::result out_type;
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return out_type(x);
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}
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};
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// template<>
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template<typename T>
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struct upgrade_val<T,T>
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{
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typedef T T1_result;
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typedef T T2_result;
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arma_inline static const T& apply(const T& x) { return x; }
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};
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//! upgrade a type to allow multiplication with a complex type
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//! eg. the int in "int * complex<double>" is upgraded to a double
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// template<>
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template<typename T, typename T2>
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struct upgrade_val< std::complex<T>, T2 >
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{
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typedef std::complex<T> T1_result;
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typedef T T2_result;
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arma_inline static const std::complex<T>& apply(const std::complex<T>& x) { return x; }
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arma_inline static T apply(const T2 x) { return T(x); }
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};
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// template<>
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template<typename T1, typename T>
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struct upgrade_val< T1, std::complex<T> >
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{
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typedef T T1_result;
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typedef std::complex<T> T2_result;
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arma_inline static T apply(const T1 x) { return T(x); }
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arma_inline static const std::complex<T>& apply(const std::complex<T>& x) { return x; }
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};
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//! ensure we don't lose precision when multiplying a complex number with a higher precision real number
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template<>
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struct upgrade_val< std::complex<float>, double >
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{
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typedef std::complex<double> T1_result;
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typedef double T2_result;
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arma_inline static const std::complex<double> apply(const std::complex<float>& x) { return std::complex<double>(x); }
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arma_inline static double apply(const double x) { return x; }
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};
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template<>
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struct upgrade_val< double, std::complex<float> >
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{
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typedef double T1_result;
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typedef std::complex<float> T2_result;
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arma_inline static double apply(const double x) { return x; }
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arma_inline static const std::complex<double> apply(const std::complex<float>& x) { return std::complex<double>(x); }
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};
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//! ensure we don't lose precision when multiplying complex numbers with different underlying types
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template<>
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struct upgrade_val< std::complex<float>, std::complex<double> >
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{
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typedef std::complex<double> T1_result;
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typedef std::complex<double> T2_result;
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arma_inline static const std::complex<double> apply(const std::complex<float>& x) { return std::complex<double>(x); }
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arma_inline static const std::complex<double>& apply(const std::complex<double>& x) { return x; }
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};
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template<>
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struct upgrade_val< std::complex<double>, std::complex<float> >
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{
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typedef std::complex<double> T1_result;
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typedef std::complex<double> T2_result;
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arma_inline static const std::complex<double>& apply(const std::complex<double>& x) { return x; }
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arma_inline static const std::complex<double> apply(const std::complex<float>& x) { return std::complex<double>(x); }
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};
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//! work around limitations in the complex class (at least as present in gcc 4.1 & 4.3)
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template<>
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struct upgrade_val< std::complex<double>, float >
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{
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typedef std::complex<double> T1_result;
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typedef double T2_result;
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arma_inline static const std::complex<double>& apply(const std::complex<double>& x) { return x; }
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arma_inline static double apply(const float x) { return double(x); }
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};
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template<>
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struct upgrade_val< float, std::complex<double> >
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{
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typedef double T1_result;
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typedef std::complex<double> T2_result;
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arma_inline static double apply(const float x) { return double(x); }
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arma_inline static const std::complex<double>& apply(const std::complex<double>& x) { return x; }
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};
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//! @}
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