Re: multiple definitions of same template specialization

From:
"Greg Herlihy" <greghe@pacbell.net>
Newsgroups:
comp.lang.c++.moderated
Date:
Tue, 23 Jan 2007 08:08:23 CST
Message-ID:
<1169537241.664341.103700@38g2000cwa.googlegroups.com>
pmitran@gmail.com wrote:

Hi,

I'm curious of about the following scenario. I'm writing
a traits template for a particular application, and I'm
concerned about multiple specializations. For example,

template<typename A>
struct mytraits
{
...
};

template<> struct mytraits<short int> {...};
template<> struct mytraits<int> {...};
template<> struct mytraits<long int> {...};

my concern is that it is possible that on some compiliers,
a short int or a long int is the same type as an int, and I will
end up with multiple definitions of the same trait. Now,
it turns of that in my case, all the definitions are the same
for ints, regardless of if it is short or long (or neither).


No, "short", "int" and "long" are three distinct types - always are -
and always will be. Even when two integer types (say an "int" and a
"long") have the same size, they remain two different types (one is an
int, the other is a long).

Greg

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