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Pierre Couderc
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 Posted: Thu Dec 28, 2006 10:10 am Post subject: Tutorial and example to SGI STL hash_set |
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Generally, is there somewhere a good tutorial and examplefor the use of
SGI STL hash_set?
I am lost in SGI documentation.
More specifically, i am trying to use hat I need that a hash_set :
hash_set<c> h;
and logically the h function for my c class is missing and I get a
compile error.
How do I declare this hash function? |
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Guest
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| Posted: Sat Dec 30, 2006 10:10 am Post subject: Re: Tutorial and example to SGI STL hash_set |
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Thank you,
It is exactly the example that was missing me. I am sure that it will
be useful tou those who will be looking for "hash-set tutorial"...
The exact syntax of the hash function in not evident for me, even it it
should...
Thank you again,
Pierre
On Dec 28, 4:26 pm, "mlimber" <mlim...@gmail.com> wrote:
| Quote: | Pierre Couderc wrote:
Generally, is there somewhere a good tutorial and examplefor the use of
SGI STL hash_set?I don't know, but you can get a tutorial for the very similar and
nearly standardized std::tr1::unordered_set in Pete Becker's book on
TR1.
I am lost in SGI documentation.
More specifically, i am trying to use hat I need that a hash_set :
hash_set<c> h;
and logically the h function for my c class is missing and I get a
compile error.
How do I declare this hash function?You need to specialize the hash functor for your class:
#include <hash_set
class C { /*...*/ };
// Hashable classes must have an == operator
// We'll just stub it out here, pending definition of C
bool operator==( const C&, const C& ) { return true; }
namespace std
{
template<> struct hash<C
{
// Define the hash function. We'll just stub it out here.
size_t operator()( const C& ) const { return 0; }
};
}
void hash_set_test()
{
C c;
std::hash_set<C> hsc;
hsc.insert( c );
}
Cheers! --M |
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