Re: [boost] Interest in switch generator

From: Tobias Schwinger (tschwinger_at_[hidden])
Date: 2007-02-02 19:51:44

Andrey Semashev wrote:
> Hello Steven,
> 
> Friday, February 2, 2007, 10:16:54 PM, you wrote:
> 
>> AMDG
> 
>>     Is there any interest in a function template that generates a switch
>> statement?
> 
>> struct f {
>>     typedef void result_type;
>>     void operator()(mpl::int_<0>) const {
>>        std::cout << "2" << std::endl;
>>     }
>>     void operator()(mpl::int_<1>) const {
>>        std::cout << "1" << std::endl;
>>     }
>>     void operator()(mpl::int_<5>) const {
>>        std::cout << "0" << std::endl;
>>     }
>> };
> 
>> int main() {
>>     typedef mpl::vector<mpl::int_<0>, mpl::int_<1>, mpl::int_<5> > cases;
>>     switch<cases>(5, f()); //prints 0
>>     try {
>>         switch<cases>(3, f());
>>     } catch(bad_switch&) {}
>> }
> 
> 
> Interesting. It would be much better if it is integrated with
> Boost.Lambda. Something like this:

Phoenix2 provides this functionality.

Regards,
Tobias