Re: [Boost-users] Using different variables based on template type

Subject: Re: [Boost-users] Using different variables based on template type
From: Scott McMurray (me22.ca+boost_at_[hidden])
Date: 2009-06-03 01:54:15

2009/6/2 Ryan McConnehey <mccorywork_at_[hidden]>:
>
> Being able just add a type to a typelist and then have the appropriate
> helper functions generated would be nice but not a necessary. Â So far I'm
> having to put some logic functions into my helper functions.
>
> void putUint16(std::string const& variableName, uint16 const variable) {
> Â  m_CurrentStructure->remove(variableName);
> Â //This function call is duplicated in every helper function.
> Â  m_CurrentStructure->m_Uint16Map[variableName] = variable; Â  //This is
> needed in every helper function but the appropriate map is needs to be used.
> }
>
> Since all these helper functions are exactly the same except the map being
> called I was hoping to refactor to allow adding new type more easily.
>

And as mentioned, the "which map" issue can be handled in templates by
dispatching to an appropriate base class.

> By the way, what is a PP sequence?
>

The boost preprocessor library would allow you do do something like this:

UGLY_PREFIX_ALLOW_TYPES( (uint16)(uint32)(guid)(templated<something>) );

and auto-generate the macro invocations

UGLY_PREFIX_ALLOW_TYPE(uint16);
UGLY_PREFIX_ALLOW_TYPE(uint32);

and so on.