Function peek [src]

Returns the next len bytes from the stream, filling the buffer as necessary. Invalidates previously returned values from peek. Asserts that the Reader was initialized with a buffer capacity at least as big as len. If there are fewer than len bytes left in the stream, error.EndOfStream is returned instead. See also: peek toss

Prototype

pub fn peek(r: *Reader, n: usize) Error![]u8

Parameters

r: *Readern: usize

Possible Errors

EndOfStream

ReadFailed

See the Reader implementation for detailed diagnostics.

Example

 test peek {
    var r: Reader = .fixed("abc");
    try testing.expectEqualStrings("ab", try r.peek(2));
    try testing.expectEqualStrings("a", try r.peek(1));
}

Source

  pub fn peek(r: *Reader, n: usize) Error![]u8 {
    try r.fill(n);
    return r.buffer[r.seek..][0..n];
}  