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Home » Tip Bank » C++
Language: C++
Expertise: Intermediate
Jun 25, 1998

When an explicit creation of a temporary object is useful

If you need an object serving only as a function argument, you can use an explicit constructor call to instantiate a nameless object rather than a named one:
 
void putPixel(const point& location);
main() 
{
		PutPixel(  point(100, 100) /*create a temporary point object as an argument*/ );
}
In the example above, a temporary object is preferred since it's automatically destroyed right after it's use and there is no danger that it will be mistakenly used elsewhere in the program . One more benefit is a potential optimization: the compiler can suppress the construction and destruction of the temporary object by inline substitution.
Danny Kalev
 
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