vigra - template<> struct SquareRootTraits<ArithmeticType>

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template<> struct SquareRootTraits<ArithmeticType> |

Unary traits for the calculation of the square root of arithmetic objects.

#include <vigra/numerictraits.hxx>

This traits class is used to determine appropriate argument and result types for the function sqrt(). These traits are typically used like this:

ArithmeticType t = ...;
SquareRootTraits<ArithmeticType>::SquareRootResult r =
sqrt((SquareRootTraits<ArithmeticType>::SquareRootArgument)t);

This approach avoids 'ambiguous overload errors' when taking the square root of an integer type. It also takes care of determining the proper result of the sqrt() function of vigra::FixedPoint and of the norm() function, when it is implemented via sqrt(squaredNorm(x)). The following members are defined in `SquareRootTraits<ArithmeticType>`:

`typedef ArithmeticType Type;` | the type itself
`typedef ... SquareRootArgument;` | required argument type for srqt(), i.e. `sqrt((SquareRootArgument)x)`
`typedef ... SquareRootResult;` | result of `sqrt((SquareRootArgument)x)`

NormTraits for the built-in types are defined in #include <vigra/numerictraits.hxx>

Namespace: vigra

© Ullrich Köthe (ullrich.koethe@iwr.uni-heidelberg.de) Heidelberg Collaboratory for Image Processing, University of Heidelberg, Germany | html generated using doxygen and Python vigra 1.10.0 (Mon Nov 18 2013)