Why is std::tr1::shared_ptr<>.reset() so expensive?
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by Paul Oyster
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Published on 2010-06-15T13:11:15Z
Indexed on
2010/06/15
13:12 UTC
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Profiling some code that heavily uses shared_ptrs, I discovered that reset() was surprisingly expensive.
For example:
struct Test {
int i;
Test() {
this->i = 0;
}
Test(int i) {
this->i = i;
}
} ;
...
auto t = make_shared<Test>(1);
...
t.reset(somePointerToATestObject);
Tracing the reset() in the last line (under VC++ 2010), I discovered that it creates a new reference-counting object.
Is there a cheaper way, that reuses the existing ref-count and does not bother the heap?
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