Template Function thrust::replace_if(ForwardIterator, ForwardIterator, Predicate, const T&)¶
Function Documentation¶
-
template<typename
ForwardIterator
, typenamePredicate
, typenameT
>
voidthrust
::
replace_if
(ForwardIterator first, ForwardIterator last, Predicate pred, const T &new_value) replace_if
replaces every element in the range[first, last)
for whichpred
returnstrue
withnew_value
. That is: for every iteratori
, ifpred(*i)
istrue
then it performs the assignment*i = new_value
.The following code snippet demonstrates how to use
replace_if
to replace adevice_vector's
negative elements with0
.- Parameters
first
: The beginning of the sequence of interest.last
: The end of the sequence of interest.pred
: The predicate to test on every value of the range[first,last)
.new_value
: The new value to replace elements whichpred(*i)
evaluates totrue
.
- Template Parameters
ForwardIterator
: is a model of Forward Iterator,ForwardIterator
is mutable, andForwardIterator's
value_type
is convertible toPredicate's
argument_type
.Predicate
: is a model of Predicate.T
: is a model of Assignable, andT
is convertible toForwardIterator's
value_type
.
#include <thrust/replace.h> #include <thrust/device_vector.h> ... struct is_less_than_zero { __host__ __device__ bool operator()(int x) { return x < 0; } }; ... thrust::device_vector<int> A(4); A[0] = 1; A[1] = -3; A[2] = 2; A[3] = -1; is_less_than_zero pred; thrust::replace_if(A.begin(), A.end(), pred, 0); // A contains [1, 0, 2, 0]
- See
- See
replace
- See
replace_copy
- See
replace_copy_if