Re: [Boost-users] [function] using with CRTP

From: Russell L. Carter (rcarter_at_[hidden])
Date: 2008-01-23 14:29:22

Doh!

Thanks.

Steven Watanabe wrote:
> AMDG
> 
> Russell L. Carter wrote:
>> then I
>> get "void value not ignored as it ought to be" at the line:
>> "FooFunc ff = put.getFooFunc();"
>>
>> I get the same thing if I try: FooFunc ff = MHBase<Put>::fooFO(put);
>>
>> Here's the code:
>>
>> #include <boost/function.hpp>
>> #include <iostream>
>>
>> class MHBAccessor {
>>      template<class> friend class MHBase;
>>      template<class Derived>
>>      static int foo(Derived& derived, int i) { return derived.foo_(i); }
>> };
>> typedef boost::function<int (int)> FooFunc;
>>
>> template <class Derived>
>> struct MHBase {
>>      Derived& derived() { return static_cast<Derived&>(*this); }
>>
>>      int foo(int i) { return MHBAccessor::foo(this->derived(), i); }
>>
>>      struct fooFO {
>>          fooFO(MHBase<Derived>& mhb) : mhb_(mhb) {}
>>          void operator()(int i) { mhb_.foo(i); }
>>   
> 
> This returns void.  FooFunc expects int.
> try
> 
> int operator()(int i) { return(mhb_.foo(i)); }
> 
> 
> In Christ,
> Steven Watanabe
> 
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