小编pal*_*pal的帖子

1)std :: call_once

A a;
std::once_flag once;

void f ( ) {
    call_once ( once, [ ] { a = A {....}; } );
}

2)功能级静态

A a;

void f ( ) {
    static bool b = ( [ ] { a = A {....}; } ( ), true );
}