Initialize an object of type bsls::BslOnce.
Declared in <bsls_bslonce.h>
#define BSLS_BSLONCE_INITIALIZER
Use this macro to initialize an object of type bsls::Once. E.g.: ` bsls::Once once = BSLS_BSLONCE_INITIALIZER; ` Note that we use an unlikely arbitrary value to permit effectively asserting a BslOnce for correct initialization.