Formattable types

[CrackedMatter]

Formatting support for libhat types.

• Generic hat::formatter
  • std::formatter specialization is provided
  • fmt::formatter can be specialized by the user (see libfmt example)
• Supported libhat types:
  • fixed_string
  • string_literal
  • cstring_view
  • cow (if the underlying non-owning type is formattable)
  • signature_element
  • signature
  • signature_view
  • fixed_signature

To-do:

• Support more types
• Make signature formatters more efficient by writing to ctx.out() directly

Note: There is a compilation error when trying to call .viewed() on a cow_writable_span that needs to be investigated.