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Buffer.toSliceCopy

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This commit is contained in:
Josh Wolfe 2018-01-16 13:28:31 -07:00
parent ee9ab15679
commit c58f5a4742
1 changed files with 19 additions and 0 deletions
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19
std/buffer.zig
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@ -146,6 +146,16 @@ pub const Buffer = struct {
pub fn ptr(self: &const Buffer) -> &u8 {
return self.list.items.ptr;
}
/// Returns a copy of this buffer's toSlice() contents
/// allocated exactly to size.
/// This method uses the provided allocator instead of
/// this object's own allocator to allocate the new array.
pub fn toSliceCopy(self: &Buffer, allocator: &Allocator) -> %[]u8 {
var result = try allocator.alloc(u8, self.len());
mem.copy(u8, result, self.toSliceConst());
return result;
}
};
test "simple Buffer" {
@ -168,3 +178,12 @@ test "simple Buffer" {
try buf2.resize(4);
assert(buf.startsWith(buf2.toSliceConst()));
}
test "Buffer.toSliceCopy" {
var buffer = try Buffer.init(debug.global_allocator, "abc");
var copy = try buffer.toSliceCopy(debug.global_allocator);
buffer.shrink(0);
try buffer.append("xyz");
assert(mem.eql(u8, buffer.toSliceConst(), "xyz"));
assert(mem.eql(u8, copy, "abc"));
}