Execute the function specified as a parameter once.

Synopsis

Declared in <llvm/Support/Threading.h>

template<
    typename Function,
    typename... Args>
void
call_once(
    once_flag& flag,
    Function&& F,
    Args&&... ArgList);

Description

Typical usage:

void foo() {...};
...
static once_flag flag;
call_once(flag, foo);

Parameters

Name

Description

flag

Flag used for tracking whether or not this has run.

F

Function to call once.

ArgList

Arguments forwarded to F.

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