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Extended Language

Documentation version: 0.3.6

LCGUdonSharp lowers extended C# constructs at build time to concrete Udon-friendly code — loops, arrays, and locals instead of runtime abstractions.

ref / out​

ref/out work on locals, fields, array elements, out var, and in recursion:

// ref/out — locals, fields, array elements, out var, recursion
Swap(ref values[0], ref values[1]);
AddUntil(ref values[0], target, out int recursiveCalls);

LINQ closures​

LINQ lambdas with captures are lowered to loops at build time — no delegates at runtime:

int[] result = values
    .Where(value => value >= minimum)
    .Select(value => value * localScale)
    .ToArray();

Also supported​

  • Closed generic static helpers
  • Closed generic interface diamonds
  • Proven dynamic
  • Array-backed local Span<int>

Build-time diagnostics​

Unsupported or ambiguous forms are rejected at build time with targeted diagnostics rather than failing at runtime. Example/GenericRestrictions contains the accepted/rejected pairs for open generics, generic heap objects, collection restrictions, interface contracts, multiple bases, and Task<T>.

See also​