Std::experimental::optional::operator->,std::experimental::optional::operator* (3) Linux Manual Page

std::experimental::optional<T>::operator->,std::experimental::optional<T>::operator* – std::experimental::optional<T>::operator->,std::experimental::optional<T>::operator*

Synopsis

constexpr const T* operator->() const; (1) (library fundamentals TS)
constexpr T* operator->(); (1) (library fundamentals TS)
constexpr const T& operator*() const&; (2) (library fundamentals TS)
constexpr T& operator*() &; (2) (library fundamentals TS)
constexpr const T&& operator*() const&&; (2) (library fundamentals TS)
constexpr T&& operator*() &&; (2) (library fundamentals TS)
Accesses the contained value.
1) Returns a pointer to the contained value.
2) Returns a reference to the contained value.
The behavior is undefined if *this does not contain a value

Parameters

(none)

Return value

Pointer or reference to the contained value.

Exceptions

(none)

Notes

This operator does not check whether the optional contains a value. If checked access is needed, value() or value_or() may be used.

Example

// Run this code

#include <experimental/optional>

#include <iostream>

#include <string>

using namespace std::literals;

int main()

{
    std::experimental::optional<int> opt1 = 1;
    std::cout << *opt1 << '\n';
    std::experimental::optional<std::string> opt2 = "abc"s;
    std::cout << opt2->size() << '\n';
}

Output:

1
3

std::experimental::optional::operator->,std::experimental::optional::operator* (3) Linux Manual Page