a |= b; is just syntactic sugar for a = a | b;. Same syntax is valid for almost every operator in C++.
But int i |= 5; is an error, because in the definition line you must have an initialisation, that is an expression that does not use the variable being declared.
int i=3; i |= 5;
is valid and will give value 7 (3 | 5) to i.
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