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Optimize std::istr::to_estr. Issue #855

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This commit is contained in:
Brian Anderson 2011-08-25 14:03:23 -07:00
parent 15e3ae7936
commit faef9490ae
1 changed files with 9 additions and 5 deletions
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14
src/lib/istr.rs
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@ -16,11 +16,15 @@ fn from_estr(s: &str) -> istr {
}
fn to_estr(s: &istr) -> str {
let s2 = "";
for u in s {
str::push_byte(s2, u);
}
ret s2;
if byte_len(s) == 0u { ret "" };
let v: [u8] = unsafe::reinterpret_cast(s);
let vlen = vec::len(v);
assert vlen > 0u;
vec::unsafe::set_len(v, vlen - 1u);
let res = str::unsafe_from_bytes(v);
vec::unsafe::set_len(v, vlen);
unsafe::leak(v);
ret res;
}
fn from_estrs(ss: &[str]) -> [istr] {