C + + interview question: ++i and i++ which is high efficiency?

1, when the data type of the variable i is the C + + language default provided by the type, they are the same efficiency.

The number of bars executed from its assembly is the same, so its execution efficiency is the same (interested in using GDB to view the assembly code)

2, our custom data type, ++i efficiency is higher than i++, through operator overloading to give you this point.

Operator operator::operator++ ()
{
++value; Internal member variables
return *this;
}

Operator operator::operator++ (int)
{
Operator temp;
Temp.value=value;
value++;
return temp;
}

After + + must have a temporary object can be completed, the creation of temporary objects, a series of copy action needs to occur, efficiency is naturally much lower than the direct reference object.

C + + interview question: ++i and i++ which is high efficiency?