Compile-time test to determine if a type T has a notion of "magnitude", i.e. if std::abs(T) is a valid expression. More...
#include <oomph_definitions.h>
Inheritance diagram for oomph::HasMagnitude< T, class >:
Detailed Description
Compile-time test to determine if a type T has a notion of "magnitude", i.e. if std::abs(T) is a valid expression.
The primary template defaults to "false".
A partial specialisation (below) is selected automatically via SFINAE ("Substitution Failure Is Not An Error") if the expression
std::abs(std::declval<T>())
is valid. In that case HasMagnitude<T>::value evaluates to true.
This facility is used to prevent compilation failures in generic code where operations involving std::abs() only make sense for numerical types.
Example: HasMagnitude<double>::value -> true HasMagnitude<std::complex<double>>::value -> true HasMagnitude<Vector<double>>::value -> false
Definition at line 122 of file oomph_definitions.h.
The documentation for this struct was generated from the following file: