Created
July 19, 2017 06:00
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Rust code shared from the playground
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| extern crate num; | |
| use num::BigInt; | |
| use num::bigint::ToBigInt; | |
| pub struct GString(pub String); | |
| pub struct Gstr<'a>(pub &'a str); | |
| impl ToBigInt for GString { | |
| fn to_bigint(&self) -> Option<BigInt> { | |
| Some(BigInt::from_signed_bytes_le(self.0.as_bytes())) | |
| } | |
| } | |
| impl<'a> ToBigInt for Gstr<'a> { | |
| fn to_bigint(&self) -> Option<BigInt> { | |
| GString(self.0.to_owned()).to_bigint() | |
| } | |
| } | |
| impl GString { | |
| pub fn from_bigint(src: &BigInt) -> String { | |
| String::from_utf8(src.to_signed_bytes_le()).unwrap() | |
| } | |
| } | |
| fn main(){ | |
| use num::Num; | |
| use num::bigint::ToBigInt; | |
| use {GString, Gstr}; | |
| let teststr = "那是一年春天"; | |
| let bigint = Gstr(teststr).to_bigint().unwrap(); | |
| let bigstr = bigint.to_str_radix(10); | |
| let bigint2 = BigInt::from_str_radix(bigstr.as_str(), 10).unwrap(); | |
| let gstring = GString::from_bigint(&bigint2); | |
| assert_eq!(teststr, gstring); | |
| } |
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