std::map::const_iterator template compilation error

Question

I have a template class that contains a std::map that stores pointers to T which refuses to compile:

template 
class Foo
{
public         


        

Answer 1

Use typename:

typename std::map::const_iterator begin() const ...

When this is first passed by the compiler, it doesn't know what T is. Thus, it also doesn't know wether const_iterator is actually a type or not.

Such dependent names (dependent on a template parameter) are assumed to

• not be types unless prefixed by typename
• not to be templates unless directly prefixed by template.