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authorBarnabás Pőcze <pobrn@protonmail.com>2024-10-01 16:03:32 +0000
committerLaurent Pinchart <laurent.pinchart@ideasonboard.com>2024-10-03 01:36:29 +0300
commite879a86979ab368cd3744bd82fdc7c3013685f0f (patch)
treeab3f66bffff3205250a3abf1a4a90d52ee7d51b6 /src/android/camera_metadata.h
parent3088e14e814eb3bb25103de8f5402ef6b0211689 (diff)
libcamera: yaml_parser: Take string keys in `std::string_view`
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>
Diffstat (limited to 'src/android/camera_metadata.h')
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