Re: [Mingw-users] FW: Compiling Problems with insert().

[Oscar F. <of...@wa...>]

"Tommy Ngo" <pn...@vi...> writes:

> I am having problems compiling
> the code below with Mingw32 (GCC v3.2).
> Can you please help me with this?
> 
> Thanks,
> 
> Tommy.
> 
> 
> --------------------------------------------
> #include<iostream>
> #include<vector>
> 
> using namespace std;
> 
> struct Data {
>   vector<string> x;
> };
> 
> 
> int main(void) {
>    
>    vector<Data> vec(10);
> 
>    vec[0].x.insert(&vec[0].x[0], "data");
> 
>    cout << vec[0].x[0] << endl;
> 
>    return 0;
> 
> }
> --------------------------------------------
> 
> 
> Here is the error message:
> 
> >Error Message:
> >--------------
> >
> >insert.cc: In function `int main()':
> >insert.cc:15: no matching function for call to `std::vector<std::string,
> >   std::allocator<std::string> >::insert(std::string*, const
> >char[5])'

[snip]

Esa Vuokko explained the problem on this mailing list a few hours ago:

--- Quote

&y[0].x[0] returns a pointer to std::string.
vector::insert expects vector::iterator.
libstdc++v2 used pointers as iterators, while
libstdc++v3 uses classes with neccesary operators
defined.

To get corresponding iterator in this case, you can use
y[0].x.begin()

or in general (for random access containers)
y[0].x.begin()+n
where n is zero-based index.

--- End quote.

[snip]

> -----Original Message-----
> From: Bjarne Stroustrup [mailto:bs...@re...]
> Sent: Thursday, September 26, 2002 11:59 AM
> To: pn...@vi...
> Subject: Re: Compiling Problems with insert(). 
> 
> 
> Correction: The compiler I used wasn't GCC 3.2. With GCC 3.2 I get
> the same error as you do. With EDG on SGI, your program compiles and
> runs as expected, giving the output "data"

I'm afraid B.S. is too busy to *think* about every request for
technical support people throws at him <g>

[snip]

-- 
Oscar