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Apply argument-dependent lookup on user-defined types. (using std::)

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This commit is contained in:
Chen-Pang He
2013-07-20 23:30:37 +08:00
parent dda869051d
commit ede27f5780
2 changed files with 46 additions and 20 deletions
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23
unsupported/Eigen/src/MatrixFunctions/MatrixExponential.h
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@@ -164,10 +164,16 @@ struct MatrixExponential<MatrixType>::ScalingOp
ScalingOp(int squarings) : m_squarings(squarings) { }
inline const RealScalar operator() (const RealScalar& x) const
{ return std::ldexp(x, -m_squarings); }
{
using std::ldexp;
return ldexp(x, -m_squarings);
}
inline const ComplexScalar operator() (const ComplexScalar& x) const
{ return ComplexScalar(std::ldexp(x.real(), -m_squarings), std::ldexp(x.imag(), -m_squarings)); }
{
using std::ldexp;
return ComplexScalar(ldexp(x.real(), -m_squarings), ldexp(x.imag(), -m_squarings));
}
private:
int m_squarings;
@@ -297,13 +303,14 @@ EIGEN_STRONG_INLINE void MatrixExponential<MatrixType>::pade17(const MatrixType
template <typename MatrixType>
void MatrixExponential<MatrixType>::computeUV(float)
{
using std::frexp;
if (m_l1norm < 4.258730016922831e-001) {
pade3(m_M);
} else if (m_l1norm < 1.880152677804762e+000) {
pade5(m_M);
} else {
const float maxnorm = 3.925724783138660f;
std::frexp(m_l1norm / maxnorm, &m_squarings);
frexp(m_l1norm / maxnorm, &m_squarings);
if (m_squarings < 0) m_squarings = 0;
MatrixType A = CwiseUnaryOp<ScalingOp, const MatrixType>(m_M, m_squarings);
pade7(A);
@@ -313,6 +320,7 @@ void MatrixExponential<MatrixType>::computeUV(float)
template <typename MatrixType>
void MatrixExponential<MatrixType>::computeUV(double)
{
using std::frexp;
if (m_l1norm < 1.495585217958292e-002) {
pade3(m_M);
} else if (m_l1norm < 2.539398330063230e-001) {
@@ -323,7 +331,7 @@ void MatrixExponential<MatrixType>::computeUV(double)
pade9(m_M);
} else {
const double maxnorm = 5.371920351148152;
std::frexp(m_l1norm / maxnorm, &m_squarings);
frexp(m_l1norm / maxnorm, &m_squarings);
if (m_squarings < 0) m_squarings = 0;
MatrixType A = CwiseUnaryOp<ScalingOp, const MatrixType>(m_M, m_squarings);
pade13(A);
@@ -333,6 +341,7 @@ void MatrixExponential<MatrixType>::computeUV(double)
template <typename MatrixType>
void MatrixExponential<MatrixType>::computeUV(long double)
{
using std::frexp;
#if LDBL_MANT_DIG == 53 // double precision
computeUV(double());
#elif LDBL_MANT_DIG <= 64 // extended precision
@@ -346,7 +355,7 @@ void MatrixExponential<MatrixType>::computeUV(long double)
pade9(m_M);
} else {
const long double maxnorm = 4.0246098906697353063L;
std::frexp(m_l1norm / maxnorm, &m_squarings);
frexp(m_l1norm / maxnorm, &m_squarings);
if (m_squarings < 0) m_squarings = 0;
MatrixType A = CwiseUnaryOp<ScalingOp, const MatrixType>(m_M, m_squarings);
pade13(A);
@@ -364,7 +373,7 @@ void MatrixExponential<MatrixType>::computeUV(long double)
pade13(m_M);
} else {
const long double maxnorm = 3.2579440895405400856599663723517L;
std::frexp(m_l1norm / maxnorm, &m_squarings);
frexp(m_l1norm / maxnorm, &m_squarings);
if (m_squarings < 0) m_squarings = 0;
MatrixType A = CwiseUnaryOp<ScalingOp, const MatrixType>(m_M, m_squarings);
pade17(A);
@@ -382,7 +391,7 @@ void MatrixExponential<MatrixType>::computeUV(long double)
pade13(m_M);
} else {
const long double maxnorm = 2.884233277829519311757165057717815L;
std::frexp(m_l1norm / maxnorm, &m_squarings);
frexp(m_l1norm / maxnorm, &m_squarings);
if (m_squarings < 0) m_squarings = 0;
MatrixType A = CwiseUnaryOp<ScalingOp, const MatrixType>(m_M, m_squarings);
pade17(A);