Re: Issue with contracts and assertions
Am 23.05.2014 16:44, schrieb Rene Zwanenburg: On Friday, 23 May 2014 at 14:38:27 UTC, Andre wrote: Am 23.05.2014 16:34, schrieb Rene Zwanenburg: In case there is a reason that the assertion is not run, if feels very dangerous for me that all assertions can be disabled by mistake just by adding an interface to a class. At least a compiler messsage should be thrown to warn about "useless" assertions Kind regards André I completely agree. A quick search on the issue tracker shows there are some serious bugs involving in contracts and interfaces[0]. It's probably best to keep away from them until the situation improves. [0]: https://issues.dlang.org/buglist.cgi?quicksearch=in%20contract%20interface ): I found my issue: https://issues.dlang.org/show_bug.cgi?id=12321 I just think about whether it is possible to build a contracts library similiar to C4J (Contracts 4 Java). I like the classed based approach. Kind regards André
Re: Issue with contracts and assertions
On Friday, 23 May 2014 at 14:38:27 UTC, Andre wrote: Am 23.05.2014 16:34, schrieb Rene Zwanenburg: In case there is a reason that the assertion is not run, if feels very dangerous for me that all assertions can be disabled by mistake just by adding an interface to a class. At least a compiler messsage should be thrown to warn about "useless" assertions Kind regards André I completely agree. A quick search on the issue tracker shows there are some serious bugs involving in contracts and interfaces[0]. It's probably best to keep away from them until the situation improves. [0]: https://issues.dlang.org/buglist.cgi?quicksearch=in%20contract%20interface
Re: Issue with contracts and assertions
Am 23.05.2014 16:34, schrieb Rene Zwanenburg:
On Friday, 23 May 2014 at 13:45:07 UTC, Andre wrote:
Hi,
for the attached code I noticed some strange behaviors.
I compile the programm with: dmd main -unittest
The expected assertion of the method c pre condition is
not raised.
It is only raised if class A not implements interface I.
On the otherside the commented assertion in the invariant is working
fine.
Is this a bug?
Kind regards
André
interface I {
void c();
}
class A : I {
invariant() {
//assert(false, "Assert INVARIANT"); // Working
}
void c()
in {
assert(false, "Assert IN");
}
body {
}
}
unittest {
A a = new A();
a.c();
}
void main(){}
I'm not sure. An implementation shouldn't be allowed to have stricter
pre-conditions than it's base class or interface. On the other hand it
should be able to relax them.
In case there is a reason that the assertion is not run,
if feels very dangerous for me that all assertions can be
disabled by mistake just by adding an interface to a class.
At least a compiler messsage should be thrown to warn about
"useless" assertions
Kind regards
André
Re: Issue with contracts and assertions
On Friday, 23 May 2014 at 13:45:07 UTC, Andre wrote:
Hi,
for the attached code I noticed some strange behaviors.
I compile the programm with: dmd main -unittest
The expected assertion of the method c pre condition is
not raised.
It is only raised if class A not implements interface I.
On the otherside the commented assertion in the invariant is
working
fine.
Is this a bug?
Kind regards
André
interface I {
void c();
}
class A : I {
invariant() {
//assert(false, "Assert INVARIANT"); // Working
}
void c()
in {
assert(false, "Assert IN");
}
body {
}
}
unittest {
A a = new A();
a.c();
}
void main(){}
I'm not sure. An implementation shouldn't be allowed to have
stricter pre-conditions than it's base class or interface. On the
other hand it should be able to relax them.
Issue with contracts and assertions
Hi,
for the attached code I noticed some strange behaviors.
I compile the programm with: dmd main -unittest
The expected assertion of the method c pre condition is
not raised.
It is only raised if class A not implements interface I.
On the otherside the commented assertion in the invariant is working
fine.
Is this a bug?
Kind regards
André
interface I {
void c();
}
class A : I {
invariant() {
//assert(false, "Assert INVARIANT"); // Working
}
void c()
in {
assert(false, "Assert IN");
}
body {
}
}
unittest {
A a = new A();
a.c();
}
void main(){}
