Re: a very interesting problem of hash_map<> and map<>
On Jun 30, 2:51 am, newbie <mitbb...@yahoo.com> wrote:
Same thing g++ complains when using hash_map<>, but is happy with
map<> --I understand hahs_map is not standardized, but since the
compiler didn't complain something like 'hash_map<> not defined', I
suppose it's supported and should behave well when I used it
Like most C++ compilers, g++ does support a hash_map container,
provided you include the right headers. Note, however, that
ther requirements for the key type are not the same as for
std::map; std::map requires that the key be "less than
comparable", where as hash_map requires equality and hashable.
If you've defined the six comparison operators for your key
type, the probable problem is that you haven't defined a hash
function for it.
James Kanze (Gabi Software) email: firstname.lastname@example.org
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