deductionguidesforstd::optional(3) | C++ Standard Libary | deductionguidesforstd::optional(3) |
NAME¶
deductionguidesforstd::optional - deductionguidesforstd::optional
Synopsis¶
Defined in header <optional>
template<class T> (since C++17)
optional(T) -> optional<T>;
One deduction guide is provided for std::optional to account for the edge
cases
missed by the implicit deduction guides, in particular, non-copyable
arguments and
array to pointer conversion
Example¶
// Run this code
#include <optional>
int main()
{
int a[2];
std::optional oa{a}; // explicit deduction guide is used in this case
}
2022.07.31 | http://cppreference.com |