structs and STL stack

[Christian Christmann]

Hi,

I'd like to store structs on an STL stack.

Here is a piece of my code:

#inclue <stack>
...

struct storeInfo {
int a;
} structInfo;

stack< storeInfo > itStack;
...


When compiling with gcc 3.3.2, I get the error
message:
error: template-argument `areg_action(burm_state*,

>)::storeInfo' uses local type `areg_action(burm_state*,

>)::storeInfo'

error: template argument 2 is invalid
error: ISO C++ forbids declaration of `itStack' with no type

What is wrong?
Thank you.

Chris

 

[Gavin Deane]

Hi,

I'd like to store structs on an STL stack.

Here is a piece of my code:

#inclue <stack>
...

struct storeInfo {
int a;
} structInfo;

stack< storeInfo > itStack;
...


When compiling with gcc 3.3.2, I get the error
message:
error: template-argument `areg_action(burm_state*,


error: template argument 2 is invalid
error: ISO C++ forbids declaration of `itStack' with no type

What is wrong?

Possibly part of what is wrong is that you aren't posting minimal
compileable code copied and pasted directly from your code editor into
your message, thereby risking obfuscating your question and making it
harder for people to help you.
http://www.parashift.com/c++-faq-lite/how-to-post.html#faq-5.8

Comeau online has no problem with the short program below. Can you
compile it?

#include <stack>

struct storeInfo
{
int a;
};

int main()
{
std::stack<storeInfo> itStack;
}

Gavin Deane

 

[Christian Christmann]

Comeau online has no problem with the short program below. Can you compile

it?

#include <stack>

struct storeInfo
{
int a;
};

int main()
{
std::stack<storeInfo> itStack;
}
}

Yes, your code works fine.

But why can I not compile it when I move the struct into the main
function?

like:

#include <stack>
int main()
{

struct storeInfo
{
int a;
};

std::stack<storeInfo> itStack;
}

 

[TB]

Christian Christmann skrev:

Yes, your code works fine.

But why can I not compile it when I move the struct into the main
function?

like:

#include <stack>
int main()
{

struct storeInfo
{
int a;
};

std::stack<storeInfo> itStack;
}

You are not allowed to use local types (no linkage) as template
arguments. Only types with external linkage are allowed.

 

[Greg Comeau]

Yes, your code works fine.

But why can I not compile it when I move the struct into the main
function?

like:

#include <stack>
int main()
{

struct storeInfo
{
int a;
};

std::stack<storeInfo> itStack;
}

This discusses a related issue with the same underlying reason:

http://www.comeaucomputing.com/techtalk/templates/#stringliteral