Is there in the STL or in Boost a set of generic simple comparison functions?

The one I found are always requiring template parameters, and/or instantiation of a struct template.

I'm looking for something with a syntax like :

if ( is_greater(x,y) )
{
   ...
}

Which could be implemented as :

template <typename T>
bool is_greater(const T& x, const T& y)
{
    return x > y + Precision<T>::eps;
}