Template typedefs - What's your work around?

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梦谈多话
梦谈多话 2020-11-29 00:22

C++ 0x has template aliases (sometimes referred to as template typedefs). See here. Current spec of C++ does not.

What do you like to use as work around ? Container

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  •  悲哀的现实
    2020-11-29 00:54

    What do you like to use as work around ? Container objects or Macros ? Do you feel its worth it ?

    The canonical way is to use a metafunction like thus:

    template 
    struct my_string_map {
        typedef std::map type;
    };
    
    // Invoke:
    
    my_string_map::type my_str_int_map;
    

    This is also used in the STL (allocator::rebind) and in many libraries including Boost. We use it extensively in a bioinformatical library.

    It's bloated, but it's the best alternative 99% of the time. Using macros here is not worth the many downsides.

    (EDIT: I've amended the code to reflect Boost/STL conventions as pointed out by Daniel in his comment.)

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