C++: avoid optimizing out variable -


i have useful code in constructor or class valuable. want sure it's executed before submain. how can guarantee it's not optimized out?

int main() {     // dear compiler, please don't optimize ctor call out!     valuable var;      return submain(); }

is local variable enough? need use static:

static valuable *v = new valuable(); delete v; v = null;

can shorten previous 1 liner:

delete new valuable();

if constructor or destructor has observable behavior, compiler not allowed optimize out. there's no need tricky.


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