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less<TYPE>
template <typename T,typename F=less<T>>
int compare(const T &v1,const T &v2,F f=F())
{
}
I can't understand "F f=F()",because the return_type of less<T> is bool,so why a bool can be given to f ，its rerutn_type is typename less<T>.
int compare(const T &v1,const T &v2,F f=F())
{
}
I can't understand "F f=F()",because the return_type of less<T> is bool,so why a bool can be given to f ，its rerutn_type is typename less<T>.
Last edited on
F() - an anonymous temporary object of type F (which is value initialised) http://en.cppreference.com/w/cpp/language/value_initialization
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