generic

Generic functions with angle-bracket type and size parameters.

Syntax: fn <name><T, size N>(<params>) → <type> <block>

Category#

type

Related#

• fn
• class
• magnitudo

Examples#

radix/corpus/generic/generic.fab (canonical · concept)#

Generic functions with angle-bracket type and size parameters.

# =============================================================================
# generic — Generic functions with angle-bracket type and size parameters
# =============================================================================
#
# What this teaches:
#   • Generic functions with angle-bracket type and size parameters.
#   • Related keywords: fn, class, size
#
# Common mistakes:
#   • Type parameter not satisfying bounds — generic parameters must meet any constraints declared on the generic function or class.
#
# See also: fn, class, size
# =============================================================================

# Generic functions with angle-bracket type parameters
#
# Type and size parameters appear in `<...>` before value parameters.
#
# GRAMMAR:
#   funcDecl :← 'fn' ident genericParams? '(' valueParams ')' ...
#   genericParams :← '<' (ident | 'size' ident) (',' (ident | 'size' ident))* '>'
#
# EXPECTED OUTPUT:
#   generic function signatures paratae
#
# BACKEND: Generic call codegen gap on Rust (`T: Clone`; whitelist: generic/generic.fab).
# Call sites are deferred in this smoke exemplar.

fn identitas<T>(T value) → T {
    return value
}

fn primum<T>(list<T> res) → T ∪ none {
    return res.first()
}

main {
    print "generic function signatures paratae"
}

Expected output:

generic function signatures paratae