The following works at least in g++ 4.4.4:
#include <map>
template <typename a, typename b>
class c {
private:
b defaultVal;
public:
std::map<a,b> mymap;
const b &func(a idx)
{
*auto* it=mymap.find(idx);
if (it!=mymap.end())
return it->second;
else
return defaultVal;
}
};
Note the* auto* keyword that is a C++0x extension. You'll have to compile
with the -std=gnu++0x flag.
See: http://gcc.gnu.org/projects/cxx0x.html
Regards,
Dov
2010/8/25 Erez D <erez0...@gmail.com>
>
>
> On Wed, Aug 25, 2010 at 12:08 PM, Elazar Leibovich <elaz...@gmail.com>wrote:
>
>> template <class a, class b>
>>
>> class c
>>
>> {
>>
>> private:
>>
>> b defaultVal;
>>
>> public:
>>
>> std::map<a,b> mymap;
>>
>> const b &func(a idx)
>>
>> {
>>
>> typename std::map<a,b>::iterator it(mymap.find(idx));
>>
>> if (it!=mymap.end())
>>
>> return it->second;
>>
>> else
>>
>> return defaultVal;
>>
>> }
>>
>> };
>>
>>
>> The compiler is not sure std::map<a,b>::iterator is a typename or a value.
>>
> how do i sove that ? can you give a solution ?
>
>>
>> 2010/8/25 Erez D <erez0...@gmail.com>
>>
>>> hi
>>>
>>>
>>> i am compiling the following code:
>>>
>>> 1:#include <map>
>>> 2:
>>> 3:template <class a, class b>
>>> 4:class c
>>> 5:{
>>> 6: private:
>>> 7: b defaultVal;
>>> 8: public:
>>> 9: std::map<a,b> mymap;
>>> 10: const b &func(a idx)
>>> 11: {
>>> 12: std::map<a,b>::iterator it=mymap.find(a);
>>> 13: if (it!=mymap.end())
>>> 14: return it->second;
>>> 15: else
>>> 16: return defaultVal;
>>> 17: }
>>> 18:};
>>> ...
>>> ...
>>>
>>> compiling it (under cygwin) , i get the following:
>>>
>>> $ g++ -c -o kaka.o kaka.cpp
>>> kaka.cpp: In member function 'const b& c<a, b>::func(a)':
>>> kaka.cpp:12: error: expected `;' before 'it'
>>> kaka.cpp:13: error: 'it' was not declared in this scope
>>>
>>>
>>> what's wrong ?
>>>
>>> _______________________________________________
>>> Linux-il mailing list
>>> Linux-il@cs.huji.ac.il
>>> http://mailman.cs.huji.ac.il/mailman/listinfo/linux-il
>>>
>>>
>>
>
> _______________________________________________
> Linux-il mailing list
> Linux-il@cs.huji.ac.il
> http://mailman.cs.huji.ac.il/mailman/listinfo/linux-il
>
>
_______________________________________________
Linux-il mailing list
Linux-il@cs.huji.ac.il
http://mailman.cs.huji.ac.il/mailman/listinfo/linux-il
