http://d.puremagic.com/issues/show_bug.cgi?id=5462

           Summary: std.container.BinaryHeap enforce message + pop
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: Phobos
        AssignedTo: nobody@puremagic.com
        ReportedBy: bearophile_hugs@eml.cc


--- Comment #0 from bearophile_hugs@eml.cc 2011-01-19 14:34:44 PST ---
A D2 program:

import std.container;
void main() {
    auto h = BinaryHeap!(int[])([]);
    h.removeFront();
}


It throws the exception: object.Exception@...\dmd\src\phobos\std\container.d(2592): Enforcement failed

In a larger program such error message is bad because it doesn't give a lot of information. To improve the situation a little I suggest to modify the enforce at line 2592:

    void removeFront()
    {
        enforce(!empty);

Adding an error message that helps understand what the error is:

enforce(!empty, "Attempt to remove the front of an empty heap");

(The future stack trace on Windows will probably also give the line number 4 of
the user program.)

-------------------------

In code that uses the BinaryHeap I've often used two lines of code like this:

auto item = heap.front();
heap.removeFront();

So I suggest to add to BinaryHeap a handy member function pop() that does both
things:
auto item = heap.pop();

-- 
Configure issuemail: http://d.puremagic.com/issues/userprefs.cgi?tab=email
------- You are receiving this mail because: -------