http://d.puremagic.com/issues/show_bug.cgi?id=10650
Summary: std.bitmanip.FixedBitArray Product: D Version: D2 Platform: All OS/Version: All Status: NEW Severity: enhancement Priority: P2 Component: Phobos AssignedTo: nob...@puremagic.com ReportedBy: bearophile_h...@eml.cc --- Comment #0 from bearophile_h...@eml.cc 2013-07-15 17:00:54 PDT --- This is a struct with no defined constructor that uses a bit array of statically known size: import std.bitmanip: BitArray; struct Foo { enum nBits = 1_024; size_t[nBits / size_t.sizeof] buffer; BitArray bitSet; bool isInitialized = false; void bar() /*pure nothrow*/ { if (!isInitialized) { bitSet.init(buffer, nBits); isInitialized = true; } // ....... } } void main() {} A statically known size is useful to reduce pressure a bit on the GC, to increase cache locality, etc. So I suggest to introduce in std.bitmanip a simple FixedBitArray based on BitArray that offers a simpler usage for statically known sizes of bit arrays: struct FixedBitArray(size_t nBits) { private size_t[nBits / size_t.sizeof + (nBits % size_t.sizeof) ? 1 : 0] buffer; ... } import std.bitmanip: FixedBitArray; struct Foo { FixedBitArray!(1_024) bitSet; void bar() pure nothrow { // ....... } } void main() {} An alternative name is "BoundedBitArray" as in the Ada 2012 bounded collections. An alternative is to modify BitArray to allow both usages nicely. -- Configure issuemail: http://d.puremagic.com/issues/userprefs.cgi?tab=email ------- You are receiving this mail because: -------