NAME¶

deductionguidesforstd::valarray - deductionguidesforstd::valarray

Synopsis¶

Defined in header <valarray>
template<typename T, std::size_t cnt> (since C++17)
valarray(const T(&)[cnt], std::size_t) -> valarray<T>;

This deduction guide is provided for std::valarray to allow deduction from array and
size (note that deduction from pointer and size is covered by the implicit guides)

Example¶

// Run this code

#include <valarray>
#include <iostream>

int main()
{
int a[] = {1, 2, 3, 4};
std::valarray va(a, 3); // uses explicit deduction guide
for (int x : va)
std::cout << x << ' ';
}

Output:¶

1 2 3