Opened 12 years ago
Closed 12 years ago
#4544 closed Bugs (fixed)
shared_ptr seems to be mistake in unordered_set
| Reported by: | Owned by: | Daniel James | |
|---|---|---|---|
| Milestone: | Boost 1.47.0 | Component: | hash |
| Version: | Boost 1.44.0 | Severity: | Problem |
| Keywords: | Cc: |
Description
class Abc { };
int main() {
boost::shared_ptr a(new Abc); boost::shared_ptr b(new Abc); unordered_set<shared_ptr<Abc> > xx; xx.insert(a); xx.insert(b);
always get 1 here, cout << xx.hash_function()(a) << " " << xx.hash_function() << endl;
return 0;
}
judging two objects pointed by shared_ptr should compare the address of them, but how hash_function() always returns 1?
Change History (2)
comment:1 by , 12 years ago
| Component: | None → hash |
|---|---|
| Milestone: | Boost.Jam 4.0.0 → To Be Determined |
| Owner: | set to |
| Status: | new → assigned |
comment:2 by , 12 years ago
| Milestone: | To Be Determined → Boost 1.47.0 |
|---|---|
| Resolution: | → fixed |
| Status: | assigned → closed |
shared_ptr now has support for hash in trunk [69260].
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Boost.Hash doesn't have support for
shared_ptr, but there's a bug which causes it to convert them to bools (which is why it's always 1). If you defineBOOST_HASH_NO_IMPLICIT_CASTSthen it will correctly fail to compile. This will probably happen by default in Boost 1.45.