Pushing back a new struct on a list/vector

[eriwik]

Consider this:

#inlcude <list>

struct elem {
int col;
int val;
};

int main() {
std::list<eleml;

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

[Alf P. Steinbach]

* er****@student.chalmers.se:

Consider this:

#inlcude <list>

struct elem {
int col;
int val;
};

int main() {
std::list<eleml;

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?

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?

[mimi]

"er****@student.chalmers.se 写�：
"

Consider this:

#inlcude <list>

struct elem {
int col;
int val;
};

int main() {
std::list<eleml;

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.

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

[David Harmon]

On 22 Nov 2006 01:07:20 -0800 in comp.lang.c++,
"er****@student.chalmers.se" <er****@student.chalmers.sewrote,

>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.

Sorry, no way to do that, but you can make it nearly anonymous by
limiting the scope of the very short-lived name.

{elem e = {1,1}; l.push_back(e);}