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Support allocating 0 bit types #6239

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Merged
merged 2 commits into from
Sep 6, 2020
Merged

Support allocating 0 bit types #6239

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bf1d834
"Support" allocating 0 bit types
pfgithub Sep 3, 2020
abe6729
Test 0 bit allocation
pfgithub Sep 3, 2020
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4 changes: 4 additions & 0 deletions lib/std/heap.zig
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Original file line number Diff line number Diff line change
Expand Up @@ -915,6 +915,10 @@ pub fn testAllocator(base_allocator: *mem.Allocator) !void {
testing.expect(slice.len == 10);

allocator.free(slice);

const zero_bit_ptr = try allocator.create(u0);
zero_bit_ptr.* = 0;
allocator.destroy(zero_bit_ptr);
}

pub fn testAllocatorAligned(base_allocator: *mem.Allocator, comptime alignment: u29) !void {
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2 changes: 1 addition & 1 deletion lib/std/mem/Allocator.zig
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Expand Up @@ -159,7 +159,7 @@ fn moveBytes(
/// Returns a pointer to undefined memory.
/// Call `destroy` with the result to free the memory.
pub fn create(self: *Allocator, comptime T: type) Error!*T {
if (@sizeOf(T) == 0) return &(T{});
if (@sizeOf(T) == 0) return @as(*T, undefined);
const slice = try self.allocAdvancedWithRetAddr(T, null, 1, .exact, @returnAddress());
return &slice[0];
}
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