0001836: Inconsistent function binding in proplists

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Date Submitted

Last Update

0001836

OpenClonk

Engine - C4Script

public

2016-10-30 11:35

2017-08-20 11:58

Reporter

Luchs

Assigned To

Priority

normal

Severity

minor

Reproducibility

always

Status

new

Resolution

open

Product Version

Target Version

9.0

Fixed in Version

Summary

0001836: Inconsistent function binding in proplists

Description

Inside a proplist function, when calling another function in the same proplist, the call is bound statically and does not depend on the value of "this" during runtime. However, references to the function are always resolved at runtime using the current "this" value. Consequently, a call foo() is not equivalent to Call(foo) which is confusing.

There's an example below which illustrates the issue. A real-world example is trying to use ScheduleCall() instead of Call().

Additional Information

static const Functions = {
  Fun1 = func() {
    Log("Fun1");
    Fun2("direct call"); // always works
    Call(Functions.Fun2, "Call(Function.Fun2)"); // always works
    Call(Fun2, "Call(Fun2)"); // doesn't work, should be equivalent to direct call

    this->Fun2("call on this"); // doesn't work, okay
    Call(this.Fun2, "Call(this.Fun2)"); // doesn't work, okay
  },

  Fun2 = func(string how) {
    Log("Fun2: %s", how);
  },
};

func Main() {
  Functions->Fun1();
  Call(Functions.Fun1); // call with different "this"
}

Date Modified	Username	Field	Change
Issue History
2016-10-30 11:35	Luchs	New Issue
2017-08-05 13:58	Maikel	Target Version	=> 8.0
2017-08-20 11:58	Zapper	Target Version	8.0 => 9.0

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