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std.priority_queue: add useful functions from ArrayList API

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The `ensureTotalCapacityPrecise`, `clearRetainingCapacity` and
`clearAndFree` functions from the ArrayList API are also useful for a
PriorityQueue.
This commit is contained in:
dweiller 2024-06-14 00:18:58 +10:00 committed by Isaac Freund
parent 3924f173af
commit cdc9d65b0d
1 changed files with 17 additions and 1 deletions
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18
lib/std/priority_queue.zig
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@ -182,8 +182,14 @@ pub fn PriorityQueue(comptime T: type, comptime Context: type, comptime compareF
better_capacity += better_capacity / 2 + 8;
if (better_capacity >= new_capacity) break;
}
try self.ensureTotalCapacityPrecise(better_capacity);
}
pub fn ensureTotalCapacityPrecise(self: *Self, new_capacity: usize) !void {
if (self.capacity() >= new_capacity) return;
const old_memory = self.allocatedSlice();
const new_memory = try self.allocator.realloc(old_memory, better_capacity);
const new_memory = try self.allocator.realloc(old_memory, new_capacity);
self.items.ptr = new_memory.ptr;
self.cap = new_memory.len;
}
@ -211,6 +217,16 @@ pub fn PriorityQueue(comptime T: type, comptime Context: type, comptime compareF
self.cap = new_memory.len;
}
pub fn clearRetainingCapacity(self: *Self) void {
self.items.len = 0;
}
pub fn clearAndFree(self: *Self) void {
self.allocator.free(self.allocatedSlice());
self.items.len = 0;
self.cap = 0;
}
pub fn update(self: *Self, elem: T, new_elem: T) !void {
const update_index = blk: {
var idx: usize = 0;