template function compareLess

[Grahamo]

Hi,

I've written a custom Iterator and managed to get things working ok.
I'm looking to see if I can reduce the amount of template instantiation
in my code however (borland gives an out of memory when compiling the
whole app).


template <class T >
class compareGreater // (T p1, T p2)
{

bool operator()( T& p1, T& p2)
{

// does comparison by calling operator< on types T
}
};


I have many types T in this codebase and I would like, if possible, to
prevent a new compareGreater<T> being instantiated for all types.
Instead I'd like all containers to use a single generic, "generic"
compareGreater routine. Is that possible?


thanks

G

 

[usr.root]

everything is possible,but there must be operator=,or operator< in
your T classes

 

[benben]

Hi,

I've written a custom Iterator and managed to get things working ok.
I'm looking to see if I can reduce the amount of template instantiation
in my code however (borland gives an out of memory when compiling the
whole app).

Ok, but then, where's your code to calculate the amount of template
instantiation?

template <class T >
class compareGreater // (T p1, T p2)
{

bool operator()( T& p1, T& p2)
{

// does comparison by calling operator< on types T
}
};

I have many types T in this codebase and I would like, if possible, to
prevent a new compareGreater<T> being instantiated for all types.
Instead I'd like all containers to use a single generic, "generic"
compareGreater routine. Is that possible?

Why would you want to prevent a new compareGreater<T> being instantiated for
each distinct T? If that's ever possible you would be able to write it
without using template (you should try.) By the way since
compareGreater:perator () is a good candidate for inlining the
instantiation would cause code bloat because ideally not a single function
is generated with however many instantiations.

thanks

G

No worries!
Ben