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Asked: 2026-05-13T06:46:11+00:00

I have been toying with an example hpp provided in the boost library and

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I have been toying with an example hpp provided in the boost library and I am trying to figure out how to use this parameter_types function correctly.

From the boost doc, parameter_types needs a ClassTypeTransform in order to parse class member function signatures.

I want to parse member function signatures, but I cannot find any doc on what this lamda expression is supposed to do.

ClassTransform
MPL – Lambda Expression to transform the class type if F is a
member function pointer

Which is from the page itself, I cannot find any sample code actually using it and I was hoping someone know how to use it to parse member function signatures.

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1 Answer

  1. Editorial Team

    ClassTransform is simply used to modify the first argument type in case parameter_types<> is applied to a member function pointer type. The default is add_reference<_>, so for instance:

    parameter_types<void(X::*)(int)>::type -> SomeSequence<void, X&, int>
parameter_types<void(X::*)(int), mpl::identity<_> >::type -> SomeSequence<void, X, int>
parameter_types<void(X::*)(int), add_pointer<_> >::type -> SomeSequence<void, X*, int>
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