Bug 2293 – access instance members from inside delegates

/*************************** OS: Windows XP Pro SP2 / Vista SP1 Compiler/linker: Digital Mars D Compiler v1.034 Tango/tangobos Lib: tango-0.99.7-bin-win32-dmd.1.033 Compiled with: no compile/link flag in the first call of the method test of the DelegateTest class instance, the delegate defined inside the inner class doesn't access correctly the outer class' member miVal in the second call of te same method, from inside a try/catch block the outer class' delegate also fails to correctly access the miVal member ***************************/ import tango.core.Exception; import tango.io.Stdout; void main() { DelegateTest test = new DelegateTest; Stdout.format("outside try/catch").newline; test.test(); Stdout.newline.format("inside try/catch").newline; try { test.test(); } catch (Exception) { } } class DelegateTest { int miVal; void delegate() mpDelegate; InnerClass moInn; this() { miVal = 5; moInn = new InnerClass; mpDelegate = { Stdout.format("OuterTest.delegate this:{} miVal:{}", cast(void*) &this, miVal).newline; }; Stdout.format("OuterTest.ctor this:{} miVal:{}", cast(void*) &this, miVal).newline; } void test() { moInn.mpInnerDelegate(); mpDelegate(); } class InnerClass { void delegate() mpInnerDelegate; this() { mpInnerDelegate = { Stdout.format("InnerClass.delegate this:{} miVal:{}", cast(void*) &this, miVal).newline; }; Stdout.format("InnerClass.ctor this:{} miVal:{}", cast(void*) &this, miVal).newline; } } }

Is this a compiletime error, a runtime error or some other form of runtime misbehaviour? Please be specific about what happens - post the output, along with what output you believe the program should generate. And assign an appropriate keyword to this issue while you're at it.

Works by design. In D1 nested delegates aren't closures and using them after enclosing function exits results in undefined behavior. this is accessed through frame pointer.