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In many cases a static string literal is used as key. Thus having the argument type be `const std::string&` is suboptimal since an `std::string` object needs to be constructed before the call. C++17 introduced `std::string_view`, using which the call can be done with less overhead, as the `std::string_view` is non-owning and may be passed in registers entirely. So make `YamlObject::{contains,operator[]}` take the string keys in `std::string_view`s. Unfortunately, that is not sufficient yet, because `std::map::find()` takes an reference to `const key_type`, which would be `const std::string&` in the case of `YamlParser`. However, with a transparent comparator such as `std::less<>` `std::map::find()` is able to accept any object as the argument, and it forwards it to the comparator. So make `YamlParser::dictionary_` use `std::less<>` as the comparator to enable the use of `std::map::find()` with any type of argument. Signed-off-by: Barnabás Pőcze <pobrn@protonmail.com> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> |
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meson.build |