Tobias Schwinger wrote:
However, here are two possible recipes of how a Boost.Function could be analyzed with this library:
1. AFAIK Boost.Function uses a non-templated parentheses operator therefore you can apply a typeof operator (or Boost.Typeof) on a pointer to its operator() function (you can do this for any functor with a non-template operator()).
2.a. The "preferred syntax" is a template parametrized with a (plain) function type to describe its signature. Partial specialization or overloading can be used to get this template argument from an instantiation of 'boost::function'.
2.b. The "compatible syntax" is a template parametrized with the sub-types of its signature. There is an (even documented) "corner-case-feature" of 'function_type_signature' that allows you to grab the argument list from a class template instantiation. Because of
^^^^ This feature has been removed ! But it doesn't hurt here because: - Possibiliy No.1 is the easier and better way to go - It is unlikely that it would work on compilers where the "compatible syntax" of Boost.Function is required.
this 'boost::functionN' is a valid signature for 'function_type' (given that 'function_type_signature.hpp' is included) together with the tag 'plain_function' to get the same type that a (preferred-syntax) 'boost::function' is instantiated with.