Type Function FindByteWriter [src]

Alias for std.io.find_byte_writer.FindByteWriter

A Writer that returns whether the given character has been written to it. The contents are not written to anything.

Prototype

pub fn FindByteWriter(comptime UnderlyingWriter: type) type

Parameters

UnderlyingWriter: type

Source

  pub fn FindByteWriter(comptime UnderlyingWriter: type) type {
    return struct {
        const Self = @This();
        pub const Error = UnderlyingWriter.Error;
        pub const Writer = io.Writer(*Self, Error, write);

        underlying_writer: UnderlyingWriter,
        byte_found: bool,
        byte: u8,

        pub fn writer(self: *Self) Writer {
            return .{ .context = self };
        }

        fn write(self: *Self, bytes: []const u8) Error!usize {
            if (!self.byte_found) {
                self.byte_found = blk: {
                    for (bytes) |b|
                        if (b == self.byte) break :blk true;
                    break :blk false;
                };
            }
            return self.underlying_writer.write(bytes);
        }
    };
}  