std::pow(std::valarray)
From cppreference.com
Defined in header <valarray>
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template< class T > std::valarray<T> pow( const std::valarray<T>& base, const std::valarray<T>& exp ); |
(1) | |
template< class T > std::valarray<T> pow( const std::valarray<T>& base, |
(2) | |
template< class T > std::valarray<T> pow( const typename std::valarray<T>::value_type& vbase, |
(3) | |
Raises a value to a power.
1) Computes the values of each element in the numeric array
base
raised to the power specified by the corresponding element from the numeric array exp
.The behavior is undefined if base.size() != exp.size().
2) Computes the values of each element in the numeric array
base
raised to the power vexp
.3) Computes the values of
vbase
raised to the power defined by the elements in the numeric array exp
.Parameters
base | - | numeric array containing the values of the base |
exp | - | numeric array containing the values of the exponent |
vbase | - | a value defining the base |
vexp | - | a value defining the exponent |
Return value
A numeric array containing the results of exponentiation.
Notes
Unqualified function (pow) is used to perform the computation. If such function is not available, std::pow is used due to argument dependent lookup.
The function can be implemented with the return type different from std::valarray. In this case, the replacement type has the following properties:
- All const member functions of std::valarray are provided.
- std::valarray, std::slice_array, std::gslice_array, std::mask_array and std::indirect_array can be constructed from the replacement type.
- All functions accepting an argument of type const std::valarray& except begin() and end() (since C++11) should also accept the replacement type.
- All functions accepting two arguments of type const std::valarray& should accept every combination of const std::valarray& and the replacement type.
- The return type does not add more than two levels of template nesting over the most deeply-nested argument type.
Defect reports
The following behavior-changing defect reports were applied retroactively to previously published C++ standards.
DR | Applied to | Behavior as published | Correct behavior |
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LWG 3074 | C++98 | T is deduced from both the scalar and the valarray for (2-3), disallowing mixed-type calls
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only deduce T from the valarray
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Example
This section is incomplete Reason: no example |
See also
applies the function std::sqrt to each element of valarray (function template) | |
(C++11)(C++11) |
raises a number to the given power (xy) (function) |
complex power, one or both arguments may be a complex number (function template) |