otbr::OnceCallback< R(Args...)> Class Template Reference

#include <src/common/callback.hpp>

Public Member Functions
template<typename T , typename = typename std::enable_if<!std::is_same<OnceCallback, T>::value>::type>
	OnceCallback (T &&func)
	OnceCallback (const OnceCallback &)=delete
OnceCallback &	operator= (const OnceCallback &)=delete
	OnceCallback (OnceCallback &&)=default
OnceCallback &	operator= (OnceCallback &&)=default
R	operator() (Args...) const &
R	operator() (Args... args) &&
bool	IsNull () const

Detailed Description

template<typename R, typename... Args>
class otbr::OnceCallback< R(Args...)>

A callback which can be invoked at most once.

IsNull is guaranteed to return true once the callback has been invoked.

Example usage: OnceCallback<int(int)> square([](int x) { return x * x; }); std::move(square)(5); // Returns 25. std::move(square)(6); // Crashes since square has already run. square(7); // Compiling error.

Inspired by Chromium base::OnceCallback (https://chromium.googlesource.com/chromium/src.git/+/refs/heads/main/base/callback.h).

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The documentation for this class was generated from the following file:

• src/common/callback.hpp