Qiita Teams that are logged in
You are not logged in to any team

Log in to Qiita Team
Community
OrganizationAdvent CalendarQiitadon (β)
Service
Qiita JobsQiita ZineQiita Blog
1
Help us understand the problem. What is going on with this article?
@syoyo

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

More than 1 year has passed since last update.

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.

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)

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

1
Help us understand the problem. What is going on with this article?
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
syoyo
RayWa(Ray and Peace)

Comments

No comments
Sign up for free and join this conversation.
Sign Up
If you already have a Qiita account Login
1
Help us understand the problem. What is going on with this article?