Using constructor call as function parameter

Question

Is it a good idea to use constructor calls as arguments? E.g. something like

doSomething(ClassA(someConstructorParameter));

Will the object be destroyed when the function terminates? Or if you have a function that takes a char* and you don't want it to mess up a string, would

someFunction(string(str).c_str());

be a bad idea?

`basic_string::c_str` returns `const char*`. – Lingxi May 13 '15 at 14:54 — Lingxi, May 13 '15 at 14:54
Oh well, it's a duplicate anyway. – Marco A. May 13 '15 at 14:58 — Marco A., May 13 '15 at 14:58

score 0 · Accepted Answer · answered May 13 '15 at 14:55

0

The temporary will be destroyed at the end of the full expression, after the function returns. So it's fine as long as the function doesn't store a pointer or reference to the argument somewhere; that won't be valid later.

answered May 13 '15 at 14:55

Mike Seymour

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Using constructor call as function parameter

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