. / - , , .
Stack , int
Stack (int size);
- ,
, . , std::string .
, Stack . , explicit:
explicit Stack (int _size);
, , . , , -.
explicit . , .
, , explicit:
- .
. , -, , .
, , private. , - . - . , , , .
++ RVO (Return Value Optimization), .
, :
NRVO (Named Return Value Optimization), , . , , .
- -. .