bitset

[Anders]

Hello.

Can anyone tell me why you have to explicitly write the template parameters
in the .to_string() method? e.g:

bitset<8> bit(string("11" ));
cout << bit.to_string<c har, char_traits<cha r>, allocator<char> >() << endl;

...

[John Harrison]

Re: bitset


"Anders" <anders> wrote in message
news:3f170412$0 $32530$edfadb0f @dread16.news.t ele.dk...[color=blue]
> Hello.
>
> Can anyone tell me why you have to explicitly write the template[/color]
parameters[color=blue]
> in the .to_string() method? e.g:
>
> bitset<8> bit(string("11" ));
> cout << bit.to_string<c har, char_traits<cha r>, allocator<char> >() <<[/color]
endl;[color=blue]
>[/color]

Noramlly which version of a template function is called is worked out based
on the types of the parameters of that function. Since to_string does not
have any parameters you have to tell the compiler explicitly which kind of
string you want returned.

john

[Victor Bazarov]

Re: bitset

"Anders" <anders> wrote...[color=blue]
> Can anyone tell me why you have to explicitly write the template[/color]
parameters[color=blue]
> in the .to_string() method? e.g:
>
> bitset<8> bit(string("11" ));
> cout << bit.to_string<c har, char_traits<cha r>, allocator<char> >() <<[/color]
endl;

Because 'to_string' is a template member. You only need to specify
the first one, by the way: bit.to_string<c har>()

However, *I* don't have to do that to output the actual bitset:

#include <bitset>
#include <iostream>
#include <string>

using namespace std;

int main()
{
bitset<8> bit(string("11" ));
cout << bit << endl;
}

works fine for me. It prints
00000011

Victor

[Ron Natalie]

Re: bitset


"Anders" <anders> wrote in message news:3f170412$0 $32530$edfadb0f @dread16.news.t ele.dk...[color=blue]
> Hello.
>
> Can anyone tell me why you have to explicitly write the template parameters
> in the .to_string() method? e.g:
>
> bitset<8> bit(string("11" ));
> cout << bit.to_string<c har, char_traits<cha r>, allocator<char> >() << endl;[/color]

Functions are not overloaded by return value. It doesn't know what kind of
string you wanted to convert it to.