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  1. #1
    John E is offline Elite Member Power Poster
    Join Date
    Apr 2001
    Manchester, England

    Using template<> without an argument type

    A program I'm working on seems to have a lot of functions like this in its header files:-

    template <>
    inline std::string to_string (bool val)
    	std::string tmp;
    	bool_to_string (val, tmp);
    	return tmp;
    How is that function any different from a regular inline function? i.e. does the empty template<> line add something special?
    "A problem well stated is a problem half solved. - Charles F. Kettering

  2. #2
    2kaud's Avatar
    2kaud is online now Super Moderator Power Poster
    Join Date
    Dec 2012

    Re: Using template<> without an argument type

    This is a function specialization.

    Somewhere you should have a templated function something like this:

    template <typename T>
    inline std::string to_string (T val)
    When a function specialization is provided, if the signature matches then the specialized function is used. if no match then the general template function is used.
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    C++20 Compiler: Microsoft VS2019 (16.11.5)

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