Help us understand the problem. What is going on with this article?

C++14 or later で constexpr で std::map 的にリードオンリー連想配列を作るメモ

背景

std::map<std::string, int> みたいなシグネチャの動的に内容変化せずリードオンリーの連想配列(変換テーブルなど)を作りたい需要はよくありますが,

constexpr std::map<std::string, int> ...

というのは直接にはできません.

ライブラリ

C++14 以降になります.

https://github.com/serge-sans-paille/frozen

frozen 使ってみましたが, いい感じに動きました. frozen::stringstd::string.c_str() はないので, 使うにはちょっと変換いります(.data()const char * ポインタが取得できるのでこれを使う)

https://github.com/mapbox/eternal

デカコーンと言われる mapbox さま謹製の eternal も良さそうです. ありがとうございます.

C++17 で実現

優秀な C++ さまから, C++17(std::string_view)で super minimal constexpr map をお教えいただきました! :tada:

素晴らしいですね, ありがとうございます.

TODO

Why not register and get more from Qiita?
  1. We will deliver articles that match you
    By following users and tags, you can catch up information on technical fields that you are interested in as a whole
  2. you can read useful information later efficiently
    By "stocking" the articles you like, you can search right away
Comments
No comments
Sign up for free and join this conversation.
If you already have a Qiita account
Why do not you register as a user and use Qiita more conveniently?
You need to log in to use this function. Qiita can be used more conveniently after logging in.
You seem to be reading articles frequently this month. Qiita can be used more conveniently after logging in.
  1. We will deliver articles that match you
    By following users and tags, you can catch up information on technical fields that you are interested in as a whole
  2. you can read useful information later efficiently
    By "stocking" the articles you like, you can search right away
ユーザーは見つかりませんでした