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Add formatted printing directly into std.Buffer #4385

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Add formatted printing directly into std.Buffer #4385

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6175fb8
Add formatted printing directly into std.Buffer
justinbalexander Feb 4, 2020
0a46e6f
Remove deprecated ReturnType field, using @typeInfo instead
justinbalexander Feb 6, 2020
f4f8675
Merge branch 'master' into formatted-print-to-std.Buffer
justinbalexander Feb 6, 2020
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18 changes: 18 additions & 0 deletions lib/std/buffer.zig
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Original file line number Diff line number Diff line change
Expand Up @@ -147,6 +147,16 @@ pub const Buffer = struct {
try self.resize(m.len);
mem.copy(u8, self.list.toSlice(), m);
}

pub fn print(self: *Buffer, comptime fmt: []const u8, args: var) !void {
try std.fmt.format(
self,
@typeInfo(@TypeOf(Buffer.append)).Fn.return_type.?.ErrorSet,
Buffer.append,
fmt,
args,
);
}
};

test "simple Buffer" {
Expand Down Expand Up @@ -190,3 +200,11 @@ test "Buffer.initCapacity" {
testing.expect(buf.capacity() == old_cap);
testing.expect(mem.eql(u8, buf.toSliceConst(), "hello"));
}

test "Buffer.print" {
var buf = try Buffer.init(testing.allocator, "");
defer buf.deinit();

try buf.print("Hello {} the {}", .{ 2, "world" });
testing.expect(buf.eql("Hello 2 the world"));
}