154 lines
4.6 KiB
C++
154 lines
4.6 KiB
C++
// Copyright (C) 2009-2010 National ICT Australia (NICTA)
|
|
//
|
|
// This Source Code Form is subject to the terms of the Mozilla Public
|
|
// License, v. 2.0. If a copy of the MPL was not distributed with this
|
|
// file, You can obtain one at http://mozilla.org/MPL/2.0/.
|
|
// -------------------------------------------------------------------
|
|
//
|
|
// Written by Conrad Sanderson - http://conradsanderson.id.au
|
|
|
|
|
|
//! \addtogroup upgrade_val
|
|
//! @{
|
|
|
|
|
|
|
|
//! upgrade_val is used to ensure an operation such as multiplication is possible between two types.
|
|
//! values are upgraded only where necessary.
|
|
|
|
template<typename T1, typename T2>
|
|
struct upgrade_val
|
|
{
|
|
typedef typename promote_type<T1,T2>::result T1_result;
|
|
typedef typename promote_type<T1,T2>::result T2_result;
|
|
|
|
arma_inline
|
|
static
|
|
typename promote_type<T1,T2>::result
|
|
apply(const T1 x)
|
|
{
|
|
typedef typename promote_type<T1,T2>::result out_type;
|
|
return out_type(x);
|
|
}
|
|
|
|
arma_inline
|
|
static
|
|
typename promote_type<T1,T2>::result
|
|
apply(const T2 x)
|
|
{
|
|
typedef typename promote_type<T1,T2>::result out_type;
|
|
return out_type(x);
|
|
}
|
|
|
|
};
|
|
|
|
|
|
// template<>
|
|
template<typename T>
|
|
struct upgrade_val<T,T>
|
|
{
|
|
typedef T T1_result;
|
|
typedef T T2_result;
|
|
|
|
arma_inline static const T& apply(const T& x) { return x; }
|
|
};
|
|
|
|
|
|
//! upgrade a type to allow multiplication with a complex type
|
|
//! e.g. the int in "int * complex<double>" is upgraded to a double
|
|
// template<>
|
|
template<typename T, typename T2>
|
|
struct upgrade_val< std::complex<T>, T2 >
|
|
{
|
|
typedef std::complex<T> T1_result;
|
|
typedef T T2_result;
|
|
|
|
arma_inline static const std::complex<T>& apply(const std::complex<T>& x) { return x; }
|
|
arma_inline static T apply(const T2 x) { return T(x); }
|
|
};
|
|
|
|
|
|
// template<>
|
|
template<typename T1, typename T>
|
|
struct upgrade_val< T1, std::complex<T> >
|
|
{
|
|
typedef T T1_result;
|
|
typedef std::complex<T> T2_result;
|
|
|
|
arma_inline static T apply(const T1 x) { return T(x); }
|
|
arma_inline static const std::complex<T>& apply(const std::complex<T>& x) { return x; }
|
|
};
|
|
|
|
|
|
//! ensure we don't lose precision when multiplying a complex number with a higher precision real number
|
|
template<>
|
|
struct upgrade_val< std::complex<float>, double >
|
|
{
|
|
typedef std::complex<double> T1_result;
|
|
typedef double T2_result;
|
|
|
|
arma_inline static const std::complex<double> apply(const std::complex<float>& x) { return std::complex<double>(x); }
|
|
arma_inline static double apply(const double x) { return x; }
|
|
};
|
|
|
|
|
|
template<>
|
|
struct upgrade_val< double, std::complex<float> >
|
|
{
|
|
typedef double T1_result;
|
|
typedef std::complex<float> T2_result;
|
|
|
|
arma_inline static double apply(const double x) { return x; }
|
|
arma_inline static const std::complex<double> apply(const std::complex<float>& x) { return std::complex<double>(x); }
|
|
};
|
|
|
|
|
|
//! ensure we don't lose precision when multiplying complex numbers with different underlying types
|
|
template<>
|
|
struct upgrade_val< std::complex<float>, std::complex<double> >
|
|
{
|
|
typedef std::complex<double> T1_result;
|
|
typedef std::complex<double> T2_result;
|
|
|
|
arma_inline static const std::complex<double> apply(const std::complex<float>& x) { return std::complex<double>(x); }
|
|
arma_inline static const std::complex<double>& apply(const std::complex<double>& x) { return x; }
|
|
};
|
|
|
|
|
|
template<>
|
|
struct upgrade_val< std::complex<double>, std::complex<float> >
|
|
{
|
|
typedef std::complex<double> T1_result;
|
|
typedef std::complex<double> T2_result;
|
|
|
|
arma_inline static const std::complex<double>& apply(const std::complex<double>& x) { return x; }
|
|
arma_inline static const std::complex<double> apply(const std::complex<float>& x) { return std::complex<double>(x); }
|
|
};
|
|
|
|
|
|
//! work around limitations in the complex class (at least as present in gcc 4.1 & 4.3)
|
|
template<>
|
|
struct upgrade_val< std::complex<double>, float >
|
|
{
|
|
typedef std::complex<double> T1_result;
|
|
typedef double T2_result;
|
|
|
|
arma_inline static const std::complex<double>& apply(const std::complex<double>& x) { return x; }
|
|
arma_inline static double apply(const float x) { return double(x); }
|
|
};
|
|
|
|
|
|
template<>
|
|
struct upgrade_val< float, std::complex<double> >
|
|
{
|
|
typedef double T1_result;
|
|
typedef std::complex<double> T2_result;
|
|
|
|
arma_inline static double apply(const float x) { return double(x); }
|
|
arma_inline static const std::complex<double>& apply(const std::complex<double>& x) { return x; }
|
|
};
|
|
|
|
|
|
|
|
//! @}
|