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std.ArrayHashMap: allow passing empty values array

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in which case the values array is set to undefined
This commit is contained in:
Andrew Kelley 2024-12-18 18:24:55 -08:00
parent 91efc5c98b
commit 3cb00c5bcd
1 changed files with 4 additions and 1 deletions
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5
lib/std/array_hash_map.zig
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@ -641,10 +641,13 @@ pub fn ArrayHashMapUnmanaged(
return self; return self;
} }
/// An empty `value_list` may be passed, in which case the values array becomes `undefined`.
pub fn reinit(self: *Self, gpa: Allocator, key_list: []const K, value_list: []const V) Oom!void { pub fn reinit(self: *Self, gpa: Allocator, key_list: []const K, value_list: []const V) Oom!void {
try self.entries.resize(gpa, key_list.len); try self.entries.resize(gpa, key_list.len);
@memcpy(self.keys(), key_list); @memcpy(self.keys(), key_list);
if (@sizeOf(V) != 0) { if (value_list.len == 0) {
@memset(self.values(), undefined);
} else {
assert(key_list.len == value_list.len); assert(key_list.len == value_list.len);
@memcpy(self.values(), value_list); @memcpy(self.values(), value_list);
} }