once"

call_once · once_flag · once_init

Include the header "Dinkum/threads/once" to use once functions in C++ code.

namespace Dinkum {
    namespace threads {
    typedef o-type once_flag;
    const once_flag once_init = .....;
    void call_once(void (*func)(void), once_flag& flag);
    }  // namespace threads
} // namespace Dinkum

`call_once`

void call_once(void (*func)(void), once_flag& flag);

The function uses flag to ensure that func is called exactly once.

`once_flag`

typedef o-type once_flag;

The type describes a data object for use as the first argument to call_once.

`once_init`

const once_flag once_init = .....;

The object provides an initial value for objects of type once_flag.

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