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c++operator-overloadingoperatorsc++-chrono

Operators in c++ chrono

What are these operators in C++ chrono : s 10s , ns 10ns , ms 10 ms , h 10h, min 10 min I know that in 10s means 10 seconds, ms means milliseconds, and so on.

Can I use letters as operators, or can I overload them?

Solution

  • Those are User Defined Literals. Yes, you can define your own.

    In a product I work on, we have defined several literals. For example, one is named _qs for QString literals, so we can write "meow"_qs and that is then a QString object - so we can do, for example:

    const int num_cats = 42;
const auto foo = "we have %1 cats"_qs.arg(num_cats);

    and foo will be a QString containing the text "we have 42 cats". Quite handy.

    Note that only the implementation can define names that do not start with underscore (_). All your own literals must start with _.