5a8ba073bc
Two separate changes that got intertwined (sorry): Make to_str pure. Closes #3691 In str, change functions like push_char to take an &mut str instead of an &str. Closes #3710
61 lines
985 B
Rust
61 lines
985 B
Rust
// xfail-fast
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use to_str::*;
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use to_str::ToStr;
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struct cat {
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priv mut meows : uint,
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mut how_hungry : int,
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name : ~str,
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}
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impl cat {
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fn speak() { self.meow(); }
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fn eat() -> bool {
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if self.how_hungry > 0 {
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error!("OM NOM NOM");
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self.how_hungry -= 2;
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return true;
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}
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else {
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error!("Not hungry!");
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return false;
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}
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}
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}
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priv impl cat {
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fn meow() {
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error!("Meow");
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self.meows += 1u;
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if self.meows % 5u == 0u {
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self.how_hungry += 1;
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}
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}
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}
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fn cat(in_x : uint, in_y : int, in_name: ~str) -> cat {
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cat {
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meows: in_x,
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how_hungry: in_y,
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name: in_name
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}
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}
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impl cat: ToStr {
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pure fn to_str() -> ~str { self.name }
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}
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fn print_out<T: ToStr>(thing: T, expected: ~str) {
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let actual = thing.to_str();
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debug!("%s", actual);
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assert(actual == expected);
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}
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fn main() {
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let nyan : ToStr = cat(0u, 2, ~"nyan") as ToStr;
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print_out(nyan, ~"nyan");
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}
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