[英]How do you use the plural method in Rust?
我一直在为Rust的std::fmt
模块中的plural
功能感到困惑,但是我需要一个具体的例子来使其真实。
它的0.9文档位于页面的一半以下: http : //static.rust-lang.org/doc/0.9/std/fmt/index.html
这对使单词复数有用吗? 例如,我将如何使用它进行打印:
This page has been visited 0 times.
This page has been visited 1 time.
This page has been visited 2 times.
我试过了,但是出现错误:
fn main() {
let mut count = 0;
let s1 = format!("This page has been visited {:d} {0, plural, one{time} other{times}}.", count);
println(s1);
}
error: argument used to format with `d` was attempted to not be used for formatting
该错误消息非常混乱,但是显然您不能对两个格式字符串使用相同的参数。 也就是说,不能同时为{:d}
和{0, plural, one{time} other{times}}
使用参数0( count
)。
通过在函数中两次传递参数,可以解决此限制:
let s1 = format!("This page has been visited {:d} {1, plural, one{time} other{times}}.", count, count);
或者,您可以使用#
将值本身放入plural
格式内:
let s1 = format!("This page has been visited {0, plural, one{# time} other{# times}}.", count);
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