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eriwik@student.chalmers.s
Guest
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 Posted: Wed Nov 22, 2006 10:10 am Post subject: Pushing back a new struct on a list/vector |
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Consider this:
#inlcude <list>
struct elem {
int col;
int val;
};
int main() {
std::list<elem> l;
l.push_back(elem e={1,1}); // Error
elem e = {1,1};
l.push_back(e); // OK
return 0;
}
Is there any way to make the non-working line work without adding a
constructor to elem? What I want to do is to create an anonymous struct
and pass it as an argument to a function using initialization. It's not
particulary important, it's just been bugging me for some time now.
--
Erik Wikström |
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mimi
Guest
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| Posted: Wed Nov 22, 2006 10:10 am Post subject: Re: Pushing back a new struct on a list/vector |
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"eriwik (AT) student (DOT) chalmers.se 写é“：
"
| Quote: | Consider this:
#inlcude <list
struct elem {
int col;
int val;
};
int main() {
std::list<elem> l;
l.push_back(elem e={1,1}); // Error
elem e = {1,1};
l.push_back(e); // OK
return 0;
}
Is there any way to make the non-working line work without adding a
constructor to elem?
I think adding a constructor is required. You could use std::pair, but |
it provides a constructor also, not by you, but by the STL.
| Quote: | What I want to do is to create an anonymous struct
and pass it as an argument to a function using initialization. It's not
particulary important, it's just been bugging me for some time now.
--
Erik Wikström |
|
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Alf P. Steinbach
Guest
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| Posted: Wed Nov 22, 2006 10:10 am Post subject: Re: Pushing back a new struct on a list/vector |
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* eriwik (AT) student (DOT) chalmers.se:
| Quote: | Consider this:
#inlcude <list
struct elem {
int col;
int val;
};
int main() {
std::list<elem> l;
l.push_back(elem e={1,1}); // Error
elem e = {1,1};
l.push_back(e); // OK
return 0;
}
Is there any way to make the non-working line work without adding a
constructor to elem?
|
No. And why would you want to?
| Quote: | What I want to do is to create an anonymous struct
and pass it as an argument to a function using initialization.
|
You might consider using std::pair, or (not yet standard) std::tr1::tuple.
--
A: Because it messes up the order in which people normally read text.
Q: Why is it such a bad thing?
A: Top-posting.
Q: What is the most annoying thing on usenet and in e-mail? |
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