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refactor(xpp): rename defer() to lazy() — lazy promise semantics - #91
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defer() was confusing: in Go, defer means run-at-scope-exit cleanup;
xpp's defer is a lazy promise wrapper (runs on first poll, not when
scheduled). Rename to lazy(), matching C++26 std::lazy (P2500) and
Kotlin's lazy {} — the established term for lazy evaluation.
- promise.h: defer() -> lazy(); doc updated
- spawn.h: spawn(Func) wraps via xpp::lazy instead of xpp::defer
- Tests: promise_test, spawn_test, http/server_test updated
- docs: promise/README.md, promise/timers.md updated
- issues: coro-nested-spawn doc wording
Adjective uses (deferred resolve, deferred member impl, spawn defers
*execution*) are untouched — those are not the function name.
Verified: C++20 build 0 errors, xpp 73/73 (ASan), C++11 build clean.
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Summary
Rename
xpp::defer()→xpp::lazy().deferwas misleading: in Go it means run-at-scope-exit cleanup, but xpp'sdefer(fn)is a lazy promise wrapper — the function runs on firstpoll(), not when scheduled, and may never run if never polled (discussed in issue #82's context).lazyis the established term for lazy evaluation (C++26std::lazy/ P2500, Kotlinlazy {},Lazy<T>).Changes
libxpp/xpp/promise.h:defer()→lazy()(definition + doc)libxpp/xpp/spawn.h:spawn(Func)now wraps viaxpp::lazy(it was the only caller ofdefer)promise_test.cpp,spawn_test.cpp,http/server_test.cppupdatedpromise/README.md,promise/timers.mdupdatedissues/coro-nested-spawn-capture-lambda-crash.md: wording updatedAdjective uses of "deferred/defer" (deferred resolution, deferred member impl, "spawn defers execution") are deliberately untouched — those are English words, not the function name.
Verification
XPP_HAS_COROUTINES;lazy()itself is C++11-compatible)