Macro bitcoin_internals::fmt_hex_exact

source · 
macro_rules! fmt_hex_exact {
    ($formatter:expr, $len:expr, $bytes:expr, $case:expr) => { ... };
}
Expand description

Format known-length array as hex.

This supports all formatting options of formatter and may be faster than calling display_as_hex() on an arbitrary &[u8]. Note that the implementation intentionally keeps leading zeros even when not requested. This is designed to display values such as hashes and keys and removing leading zeros would be confusing.

§Parameters

  • $formatter - a fmt::Formatter.
  • $len known length of $bytes, must be a const expression.
  • $bytes - bytes to be encoded, most likely a reference to an array.
  • $case - value of type Case determining whether to format as lower or upper case.

§Panics

This macro panics if $len is not equal to $bytes.len(). It also fails to compile if $len is more than half of usize::MAX.