rust/src/lib/ivec.rs

52 lines
1.1 KiB
Rust
Raw Normal View History

// Interior vector utility functions.
import option::none;
import option::some;
type operator2[T,U,V] = fn(&T, &U) -> V;
native "rust-intrinsic" mod rusti {
fn ivec_len[T](&T[] v) -> uint;
}
native "rust" mod rustrt {
fn ivec_reserve[T](&mutable T[] v, uint n);
fn ivec_on_heap[T](&T[] v) -> bool;
fn ivec_to_ptr[T](&T[] v) -> *T;
fn ivec_copy_from_buf[T](&mutable T[] v, *T ptr, uint count);
}
/// Reserves space for `n` elements in the given vector.
fn reserve[T](&mutable T[] v, uint n) {
rustrt::ivec_reserve(v, n);
}
fn on_heap[T](&T[] v) -> bool {
ret rustrt::ivec_on_heap(v);
}
fn to_ptr[T](&T[] v) -> *T {
ret rustrt::ivec_to_ptr(v);
}
fn len[T](&T[] v) -> uint {
ret rusti::ivec_len(v);
}
type init_op[T] = fn(uint) -> T;
fn init_fn[T](&init_op[T] op, uint n_elts) -> T[] {
auto v = ~[];
reserve(v, n_elts);
let uint i = 0u;
while (i < n_elts) { v += ~[op(i)]; i += 1u; }
ret v;
}
mod unsafe {
fn copy_from_buf[T](&mutable T[] v, *T ptr, uint count) {
ret rustrt::ivec_copy_from_buf(v, ptr, count);
}
}