Re: [Boost-users] [function] How do you bind two boost::function objects together?

From: Jason House (jasonhouse_at_[hidden])
Date: 2006-09-30 23:18:19

Jason House wrote:
> I'm trying to convert the input argument to a function object using a 
> small helper function object.  The code below looks relatively simple, 
> but it doesn't seem to compile.  Any ideas what could be wrong?
> 
> template<typename inputType, typename outputType>
> boost::function<outputType (int)>
> convert(boost::function<outputType (inputType)> &object_to_convert){
>    boost::function<intputType (int)> input_converter(...);
> 
>    // The following fails to compile
>    boost::function<outputType (int)> converted_function
>      (boost::lambda::bind(object_to_convert, input_converter));
> 
>    return converted_function
> }

I realize the use of local variables in the object creation is a bad 
idea, but that doesn't affect the compilation.

While I get buried in "instantiated from here" messages, here's the 
actual error message (altered to match the example)

/usr/local/include/boost/lambda/detail/function_adaptors.hpp:41:
error: no match for call to
'(const boost::function<outputType()(inputType),std::allocator<void> >)
  (const boost::function<outputType()(int),     std::allocator<void> >&)'