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 | Posted by njb303@gmail.com |  Permalink Reply |
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njb303@gmail.com 
| http://d.puremagic.com/issues/show_bug.cgi?id=3879
Summary: compile-time assertion error in mtype.c: foreach
through associative array w/ templated-class as value
Product: D
Version: 2.040
Platform: x86_64
OS/Version: Windows
Status: NEW
Severity: major
Priority: P2
Component: DMD
AssignedTo: nobody@puremagic.com
ReportedBy: njb303@gmail.com
--- Comment #0 from njb303@gmail.com 2010-03-04 11:10:38 PST ---
I'm working on a file with these classes so far:
abstract class State(T:GameEntity)
{
string _name;
@property {
const string name() const { return _name; }
this(string name) { _name = name; }
(and some empty virtual function decls that get defined by derived classes)
} // and then the actual implementation for the various State nodes will be
done through derived classes
// so if I had a class DogRobot that derives from GameEntity, then it would
// internally use a StateMachine!(DogRobot), which itself would be using
// State!(DogRobot) for its states. Somewhere in DogRobot.d it would also
// define those new State!(DogRobot)-derived classes that would then be
// added to the State Machine via addState()
class StateMachine(T:GameEntity)
{
...
State!(T)[string] _states; // THIS IS LINE 100 IN THE ERROR MESSAGES
MENTIONED LATER -- assoc array for quickly retrieving states by their names
// public, actual state objects added to the machine here
void addState(State!(T) state)
{
... (compiles fine) ...
}
void linkStates(string fromName, string toName, string eventName)
{
... (compiles fine) ...
}
// so far so good, further down I have a function called printGraph() for
debug output, and this is where I've run into assertion problems with DMD 2.040
compiler
void printStates()
{
std.stdio.writefln("States:");
// each and every one of these below causes a compile-time error,
// though different ones sometimes:
// this leads to error: "__overloadset is not a template" on line 100
foreach (string key, State!(T); _states)
std.stdio.writefln(" %1", key);
// the rest of these each, individually, result in an assertion error
// at compile-time which pops up twice.
// In the actual code I commented-out the previous problematic lines
// before trying the next approach/flavor. DMD 2.040 compiler's error
// for each of these reads as follows:
//
// Assertion failure: 'impl' on line 3886 in file 'mtype.c'
//
// abnormal program termination
// Assertion failure: 'impl' on line 3886 in file 'mtype.c'
//
// abnormal program termination
// Various problematic code for THIS error is as follows:
// first attempt
foreach (string k; _states.keys)
std.stdio.writefln(" %1", k);
// approach #2
foreach (State!(T) s; _states.values)
std.stdio.writefln(" %1", s.name);
// approach #3, but char[] k for a string-type key is probably
// incorrect in a different way I'm guessing... just a desperation
try
foreach (char[] k; _states.keys.sort)
std.stdio.writefln(" %1", k);
// approach #4
typedef State!(T) tstate;
foreach (tstate s; _states.values)
std.stdio.writefln(" %1", s.name);
} // end printStates()
} // end StateMachine class
// end code snippet
In the meantime I can probably get around this problem by getting rid of templates entirely and very carefully using delegates to act as "plugged-in behavior"... I was following the approach in an AI book I have, but there are other ways I can go about doing the same thing, I'm sure.
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