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std.ArrayList: add appendNTimesAssumeCapacity

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This commit is contained in:
Andrew Kelley 2020-07-31 01:16:17 -07:00
parent acd0dabab2
commit 9d0872a625
1 changed files with 18 additions and 0 deletions
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18
lib/std/array_list.zig
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@ -216,6 +216,15 @@ pub fn ArrayListAligned(comptime T: type, comptime alignment: ?u29) type {
mem.set(T, self.items[old_len..self.items.len], value);
}
/// Append a value to the list `n` times.
/// Asserts the capacity is enough.
pub fn appendNTimesAssumeCapacity(self: *Self, value: T, n: usize) void {
const new_len = self.items.len + n;
assert(new_len <= self.capacity);
mem.set(T, self.items.ptr[self.items.len..new_len], value);
self.items.len = new_len;
}
/// Adjust the list's length to `new_len`.
/// Does not initialize added items if any.
pub fn resize(self: *Self, new_len: usize) !void {
@ -473,6 +482,15 @@ pub fn ArrayListAlignedUnmanaged(comptime T: type, comptime alignment: ?u29) typ
mem.set(T, self.items[old_len..self.items.len], value);
}
/// Append a value to the list `n` times.
/// Asserts the capacity is enough.
pub fn appendNTimesAssumeCapacity(self: *Self, value: T, n: usize) void {
const new_len = self.items.len + n;
assert(new_len <= self.capacity);
mem.set(T, self.items.ptr[self.items.len..new_len], value);
self.items.len = new_len;
}
/// Adjust the list's length to `new_len`.
/// Does not initialize added items if any.
pub fn resize(self: *Self, allocator: *Allocator, new_len: usize) !void {