digitalmars.D.bugs - [Issue 2101] New: Please may I use mutable arrays at compile time?
- d-bugmail puremagic.com (42/42) May 12 2008 http://d.puremagic.com/issues/show_bug.cgi?id=2101
- d-bugmail puremagic.com (36/36) May 12 2008 http://d.puremagic.com/issues/show_bug.cgi?id=2101
- d-bugmail puremagic.com (35/35) Jan 10 2010 http://d.puremagic.com/issues/show_bug.cgi?id=2101
- d-bugmail puremagic.com (10/10) Jan 11 2010 http://d.puremagic.com/issues/show_bug.cgi?id=2101
- d-bugmail puremagic.com (11/11) Jan 30 2010 http://d.puremagic.com/issues/show_bug.cgi?id=2101
http://d.puremagic.com/issues/show_bug.cgi?id=2101 Summary: Please may I use mutable arrays at compile time? Product: D Version: 2.013 Platform: PC OS/Version: Windows Status: NEW Severity: enhancement Priority: P2 Component: DMD AssignedTo: bugzilla digitalmars.com ReportedBy: caron800 googlemail.com The docs say I can't use non-const arrays at compile-time. But I want to, so this is an enhancement request. The following does not compile. int ctfeTest() { char[10] a; // <--- PROBLEM return 1; } const int A = ctfeTest(); This does int ctfeTest() { char[] a; // <--- OK return 1; } but that's completely pointless. This doesn't: int ctfeTest() { char[] a = new char[10]; // <--- PROBLEM return 1; } Nor does this: int ctfeTest() { char[] a; a.length = 10; // <--- PROBLEM return 1; } Even if we can't have dynamic arrays, what's the harm with static ones? --
May 12 2008
http://d.puremagic.com/issues/show_bug.cgi?id=2101 You could use something like this (quickly hacked, dmd 1.029): T[] newCtfeArray(T)(size_t size) { T[] array; if (!size) return array; array ~= T.init; if (array.length < size) return newCtfeArray(array, size); return array; } private T[] newCtfeArray(T, U = void)(T[] array, size_t size) { while (array.length * 2 <= size) array ~= array; if (array.length < size) return array ~= newCtfeArray!(T)(size - array.length); return array; } int[] test() { // Allocate an array of 123 ints. The memory will not be freed, sigh auto a = newCtfeArray!(int)(123); foreach (i, e; a) { a[i] = e; } return a; } void main() { static const a = test(); } --
May 12 2008
http://d.puremagic.com/issues/show_bug.cgi?id=2101 Don <clugdbug yahoo.com.au> changed: What |Removed |Added ---------------------------------------------------------------------------- Keywords| |patch Janice's first case has compiled for quite a long time now. The third case, involving 'new', is very straightforward. The final case (changing length) is doubtful whether it is a good idea. I think with implementing 'new', we can close this bug. PATCH to allow dynamic array creation with new. Insert this code into interpret.c, around line 2690. Also add the declaration for it in NewExp in expression.h. Also need to change the spec to remove the restriction on using 'new'. ------------ Expression *NewExp::interpret(InterState *istate) { #if LOG printf("NewExp::interpret() %s\n", toChars()); #endif if (newtype->ty == Tarray && arguments && arguments->dim == 1) { Expression *lenExpr = ((Expression *)(arguments->data[0]))->interpret(istate); if (lenExpr == EXP_CANT_INTERPRET) return EXP_CANT_INTERPRET; return createBlockDuplicatedArrayLiteral(newtype, newtype->defaultInitLiteral(), lenExpr->toInteger()); } error("Cannot interpret %s at compile time", toChars()); return EXP_CANT_INTERPRET; } -- Configure issuemail: http://d.puremagic.com/issues/userprefs.cgi?tab=email ------- You are receiving this mail because: -------
Jan 10 2010
http://d.puremagic.com/issues/show_bug.cgi?id=2101 Walter Bright <bugzilla digitalmars.com> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |bugzilla digitalmars.com 22:58:37 PST --- Changeset 333. -- Configure issuemail: http://d.puremagic.com/issues/userprefs.cgi?tab=email ------- You are receiving this mail because: -------
Jan 11 2010
http://d.puremagic.com/issues/show_bug.cgi?id=2101 Walter Bright <bugzilla digitalmars.com> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|NEW |RESOLVED Resolution| |FIXED 22:40:30 PST --- fixed dmd 1.056 and 2.040 -- Configure issuemail: http://d.puremagic.com/issues/userprefs.cgi?tab=email ------- You are receiving this mail because: -------
Jan 30 2010