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sx/examples/optionals/0903-optionals-optional-roundtrip.sx
agra 66bdc70bf1 test: group examples into per-category folders
Move examples/*.sx and their expected/ snapshots into per-category
subfolders (examples/<category>/...). Folder = leading filename token,
with ffi-objc/ffi-jni kept whole; filenames are unchanged. The corpus
runner and LSP sweep now discover each category's expected/ dir, while
issues/ stays flat. Example 1058's repo-root-relative companion import
is made file-relative. Path strings embedded in 164 snapshots were
regenerated (path-only changes). Test-layout docs in CLAUDE.md updated.
2026-06-21 14:41:34 +03:00

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// Optional `?f32` fields in struct literals — exhaustively combine null/value
// for both fields, through both direct calls and protocol dispatch.
#import "modules/std.sx";
ProposedSize :: struct {
width: ?f32;
height: ?f32;
}
// Direct function — does it work?
direct_size :: (proposal: ProposedSize) -> f32 {
w := if pw := proposal.width { pw } else { 100.0 };
h := if ph := proposal.height { ph } else { 100.0 };
w + h
}
Sizable :: protocol {
size :: (self: *Self, proposal: ProposedSize) -> f32;
}
Widget :: struct {}
impl Sizable for Widget {
size :: (self: *Widget, proposal: ProposedSize) -> f32 {
w := if pw := proposal.width { pw } else { 100.0 };
h := if ph := proposal.height { ph } else { 100.0 };
w + h
}
}
main :: () -> void {
// Test 1: Direct call
print("=== Direct calls ===\n");
d1 := direct_size(ProposedSize.{ width = 50.0, height = null });
print("d1 = {}\n", d1);
d2 := direct_size(ProposedSize.{ width = null, height = 50.0 });
print("d2 = {}\n", d2);
d3 := direct_size(ProposedSize.{ width = null, height = null });
print("d3 = {}\n", d3);
d4 := direct_size(ProposedSize.{ width = 50.0, height = 60.0 });
print("d4 = {}\n", d4);
// Test 2: Protocol dispatch
print("=== Protocol dispatch ===\n");
w := Widget.{};
s : Sizable = w;
r1 := s.size(ProposedSize.{ width = 50.0, height = null });
print("r1 = {}\n", r1);
r2 := s.size(ProposedSize.{ width = null, height = 50.0 });
print("r2 = {}\n", r2);
r3 := s.size(ProposedSize.{ width = null, height = null });
print("r3 = {}\n", r3);
r4 := s.size(ProposedSize.{ width = 50.0, height = 60.0 });
print("r4 = {}\n", r4);
}