`std.mem.Allocator.create` replaced with better API

`std.mem.Allocator.createOne` is renamed to `std.mem.Allocator.create`.

The problem with the previous API is that even after copy elision,
the initalization value passed as a parameter would always be a copy.
With the new API, once copy elision is done, initialization
functions can directly initialize allocated memory in place.

Related:
 * #1872
 * #1873

1 files changed, 2 insertions, 1 deletions

diff --git a/std/heap.zig b/std/heap.zig
index 46b247fa7e..fd2ce1e965 100644
--- a/std/heap.zig
+++ b/std/heap.zig
@@ -518,7 +518,8 @@ fn testAllocator(allocator: *mem.Allocator) !void {
     var slice = try allocator.alloc(*i32, 100);
     assert(slice.len == 100);
     for (slice) |*item, i| {
-        item.* = try allocator.create(@intCast(i32, i));
+        item.* = try allocator.create(i32);
+        item.*.* = @intCast(i32, i);
     }
 
     slice = try allocator.realloc(*i32, slice, 20000);