std::generate
From Cppreference
| Defined in header <algorithm>
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| template< class ForwardIterator, class Generator >
void generate( ForwardIterator first, ForwardIterator last, Generator g ); |
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Assigns each element in range [first, last) a value generated by the given function object g.
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[edit] Parameters
| first, last | - | the range of elements to generate | |||||||||
| g | - | generator function object that will be called. The signature of the function should be equivalent to the following:
The type Ret must be such that an object of type ForwardIterator can be dereferenced and assigned a value of type Ret. |
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[edit] Return value
(none)
[edit] Complexity
Exactly std::distance(first, last) invocations of g() and assignments.
[edit] Equivalent function
template<class ForwardIterator, class Generator> void generate(ForwardIterator first, ForwardIterator last, Generator g) { while (first != last) { *first++ = g(); } } |
[edit] Example
The following code uses fills a vector with random numbers:
#include <algorithm> #include <iostream> #include <cstdlib> int main() { std::vector<int> v(5); std::generate(v.begin(), v.end(), std::rand); // Using the C function rand() std::cout << "v: "; for (auto iv: v) { std::cout << iv << " "; } std::cout << "\n"; }
Output:
v: 52894 15984720 41513563 41346135 51451456
[edit] See also
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assigns a range of elements a certain value (function template) |
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saves the result of N applications of a function (function template) |
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