AMDG Khandelwal, Amit wrote:
I am trying to understand the details of boost function. Below is the sample code that I am using. I was expecting the copy constructor to be invoked once. However, I see that it is called four times. I am trying to understand why does boost function need to have four copies of my objects. I am using boost version 1_33_1.
Generic libraries generally assume that function objects are cheap to copy. boost::function only stores one copy of your object, however, it is quite possible that it makes an extra copy somewhere. In addition assuming that FUNC is an appropriate specialization of boost::function, FUNC f = F(); Is specified as copy initialization, although the compiler is permitted to optimize the copy away. You can check whether F f1; FUNC f(f1); produces fewer copies. This of course depends on your compiler and optimization flags. In Christ, Steven Watanabe