Commit 5f31d54064b204910c18667d0b68b8bf2b57cffb | zig

author	LemonBoy <thatlemon@gmail.com> 2020-09-02 10:51:15+02:00
committer	LemonBoy <thatlemon@gmail.com> 2020-09-02 11:11:57+02:00
log	5f31d54064b204910c18667d0b68b8bf2b57cffb
tree	d13c9564e976e8b34aea6c196410830f792370c5
parent	73a8c9beaa63c48b6ddaeec8d2a67b239f0dec92

std: ArrayList.initCapacity now respects the specified cap

Don't use the user-supplied cap as starting point for a resize. Doing so
overallocates memory and thus negates the whole point of specifying a
precise cap value.

1 files changed, 10 insertions(+), 2 deletions(-)

lib
- std
  - array_list.zig

lib/std/array_list.zig+10-2

...	...	@@ -46,7 +46,11 @@ pub fn ArrayListAligned(comptime T: type, comptime alignment: ?u29) type {
46	46	/// Deinitialize with `deinit` or use `toOwnedSlice`.
47	47	pub fn initCapacity(allocator: *Allocator, num: usize) !Self {
48	48	var self = Self.init(allocator);
49		try self.ensureCapacity(num);
	49
	50	const new_memory = try self.allocator.allocAdvanced(T, alignment, num, .at_least);
	51	self.items.ptr = new_memory.ptr;
	52	self.capacity = new_memory.len;
	53
50	54	return self;
51	55	}
52	56
...	...	@@ -366,7 +370,11 @@ pub fn ArrayListAlignedUnmanaged(comptime T: type, comptime alignment: ?u29) typ
366	370	/// Deinitialize with `deinit` or use `toOwnedSlice`.
367	371	pub fn initCapacity(allocator: *Allocator, num: usize) !Self {
368	372	var self = Self{};
369		try self.ensureCapacity(allocator, num);
	373
	374	const new_memory = try self.allocator.allocAdvanced(T, alignment, num, .at_least);
	375	self.items.ptr = new_memory.ptr;
	376	self.capacity = new_memory.len;
	377
370	378	return self;
371	379	}
372	380