El ene. 13, 2020, a las 5:46 p. m., Corentin Jabot <corentinjabot@gmail.com> escribió:

C++20 (which is on course to be approved next month) will provide a new feature in the name of std::format derived from the popular fmt library (https://fmt.dev/), itself heavily inspired and sharing the syntax of python's format function.

std::format("Hello {}", "World") -> "Hello World";
std::format("{2} + {1} = {0}", 3, 1.0, 2) -> "1.0 + 2 = 3";

Of interest to Unicode and localization:

For now this function is mostly byte based, in that it is encoding agnostic.

However we made the interesting decision that padding is based on display width (which is fuzzily specified), as we realized the primary use case for padding was the creation of console interface

display width is complex… Unicode’s East Asian Width is often used for character width, but there’s more to that (and see <https://www.unicode.org/reports/tr11/#Scope> … see for example https://github.com/nodejs/node/blob/b0a762157793b0d9143eaa7c270da91932f2a64f/src/node_i18n.cc#L729 in Node.js — going beyond wcwidth, etc which do not reflect many terminal emulators’ behavior.