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std.Io: delete MultiWriter

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This commit is contained in:
Andrew Kelley 2025-07-20 17:09:15 -07:00
parent abed0f5129
commit d9a5a3e8c5
2 changed files with 0 additions and 56 deletions
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3
lib/std/Io.zig
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@ -456,9 +456,6 @@ pub const countingWriter = @import("Io/counting_writer.zig").countingWriter;
pub const CountingReader = @import("Io/counting_reader.zig").CountingReader;
pub const countingReader = @import("Io/counting_reader.zig").countingReader;
pub const MultiWriter = @import("Io/multi_writer.zig").MultiWriter;
pub const multiWriter = @import("Io/multi_writer.zig").multiWriter;
pub const BitReader = @import("Io/bit_reader.zig").BitReader;
pub const bitReader = @import("Io/bit_reader.zig").bitReader;

53
lib/std/Io/multi_writer.zig
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@ -1,53 +0,0 @@
const std = @import("../std.zig");
const io = std.io;
/// Takes a tuple of streams, and constructs a new stream that writes to all of them
pub fn MultiWriter(comptime Writers: type) type {
comptime var ErrSet = error{};
inline for (@typeInfo(Writers).@"struct".fields) |field| {
const StreamType = field.type;
ErrSet = ErrSet || StreamType.Error;
}
return struct {
const Self = @This();
streams: Writers,
pub const Error = ErrSet;
pub const Writer = io.GenericWriter(*Self, Error, write);
pub fn writer(self: *Self) Writer {
return .{ .context = self };
}
pub fn write(self: *Self, bytes: []const u8) Error!usize {
inline for (self.streams) |stream|
try stream.writeAll(bytes);
return bytes.len;
}
};
}
pub fn multiWriter(streams: anytype) MultiWriter(@TypeOf(streams)) {
return .{ .streams = streams };
}
const testing = std.testing;
test "MultiWriter" {
var tmp = testing.tmpDir(.{});
defer tmp.cleanup();
var f = try tmp.dir.createFile("t.txt", .{});
var buf1: [255]u8 = undefined;
var fbs1 = io.fixedBufferStream(&buf1);
var buf2: [255]u8 = undefined;
var stream = multiWriter(.{ fbs1.writer(), f.writer() });
try stream.writer().print("HI", .{});
f.close();
try testing.expectEqualSlices(u8, "HI", fbs1.getWritten());
try testing.expectEqualSlices(u8, "HI", try tmp.dir.readFile("t.txt", &buf2));
}