concurrent::LazyValue< T > Class Template Reference

#include <userver/concurrent/lazy_value.hpp>

Detailed Description

template<typename T>
class concurrent::LazyValue< T >

Lazy value computation with multiple consumers.

Definition at line 21 of file lazy_value.hpp.

Public Member Functions
	LazyValue (utils::move_only_function< T()> f)
	LazyValue (const LazyValue &)=delete
	LazyValue (LazyValue &&)=delete
LazyValue &	operator= (const LazyValue &)=delete
LazyValue &	operator= (LazyValue &&)=delete
const T &	operator() ()
	Get an already calculated result or calculate it. It is guaranteed that f is called exactly once. Can be called concurrently from multiple coroutines.

Constructor & Destructor Documentation

LazyValue()

template<typename T>

concurrent::LazyValue< T >::LazyValue ( utils::move_only_function< T()> f )

inlineexplicit

Definition at line 23 of file lazy_value.hpp.

Member Function Documentation

operator()()

template<typename T>

const T & concurrent::LazyValue< T >::operator()

(

)

Get an already calculated result or calculate it. It is guaranteed that f is called exactly once. Can be called concurrently from multiple coroutines.

Note

If f throws, it is not re-evaluated on subsequent calls (unlike with std::once_flag).

Exceptions

Anything

f throws.

Definition at line 51 of file lazy_value.hpp.

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

• userver/concurrent/lazy_value.hpp