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Showing content from https://en.cppreference.com/w/cpp/algorithm/../ranges/../utility/optional/make_optional.html below:

std::make_optional - cppreference.com

(1) (since C++17) template< class T, class... Args > constexpr std::optional<T> make_optional( Args&&... args ); (2) (since C++17) (3) (since C++17) [edit] Parameters value - the value to construct optional object with il, args - arguments to be passed to the constructor of T [edit] Return value

The constructed optional object.

[edit] Exceptions

Throws any exception thrown by the constructor of T.

[edit] Notes

T need not be movable for overloads (2,3) due to guaranteed copy elision.

[edit] Example

Possible output:

op1: a,b,c,
op2: 2,2,2,2,2,
op3: "hello world"
str: ""

[edit] See also

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