using static_cast with boost::bind

问题

I want to transform a vector of type T to a vectorof type K. I tried this, but it doesn't work:

transform(vec.rbegin(),vec.rend(),vecNew.begin(),boost::bind(static_cast<K>(),_1));

I get the error: "expected primary-expression before ‘)’ token". What am I doing wrong?

回答1:

Use the boost cast functor ll_static_cast<K>()

回答2:

There's no need for the static cast unless there is no implicit conversion from T to K. If the conversion constructor is not explicit, or if you a T::operator K(), you can just do:

transform(vec.rbegin(),vec.rend(),vecNew.begin());

Note that this reverses the order of the elements as well.

来源：https://stackoverflow.com/questions/3430152/using-static-cast-with-boostbind