invalid type for template argument [duplicate]

This question already has an answer here:

• Where and why do I have to put the “template” and “typename” keywords? 6 answers

What is wrong with my template and how to fix it? This is supposed to remove all items from Qt-ish containers, given the predicate function. The compiler yields error 'std::function': 'T::value_type' is not a valid template type argument for parameter '_Fty'

template <typename T>
void eraseIf( T &container, std::function<bool(T::value_type)> predicate)
{
    auto it = container.begin();
    while( it != container.end() )
    {
        if( predicate( *it ) )
        {
            it = container.erase( it );
        }
        else
        {
            ++it;
        }
    }
}