digitalmars.D.bugs - [Issue 4165] New: std.conv.to!int doesn't ignore whitespace
- d-bugmail puremagic.com (37/38) May 09 2010 http://d.puremagic.com/issues/show_bug.cgi?id=4165
- d-bugmail puremagic.com (15/18) May 22 2010 http://d.puremagic.com/issues/show_bug.cgi?id=4165
- d-bugmail puremagic.com (11/11) Aug 13 2010 http://d.puremagic.com/issues/show_bug.cgi?id=4165
- d-bugmail puremagic.com (14/14) Aug 15 2010 http://d.puremagic.com/issues/show_bug.cgi?id=4165
http://d.puremagic.com/issues/show_bug.cgi?id=4165 Summary: std.conv.to!int doesn't ignore whitespace Product: D Version: future Platform: All OS/Version: All Status: NEW Severity: normal Priority: P2 Component: Phobos AssignedTo: nobody puremagic.com ReportedBy: bearophile_hugs eml.cc Too much flexibility in a language and its libs causes several problems, but the opposite too makes the language and its use fussy. So there is a right intermediate point of balance to be found. The conversion from string to numbers performed by std.conv.to is excessively rigid. In Python this conversion works:123 In D v.2.043 the same produces an error: import std.conv: to; void main() { int x = to!int(" 0123\n"); } std.conv.ConvError: Can't convert value ` 0123 ' of type const(char)[] to type int Can std.conv.to be modified to ignore whitespace? In particular the ending newline is very common, for example every time I want to convert a line from a text file to a number I have to use something like this: to!int(readln().chomp()); Instead of a simpler: to!int(readln()); -- Configure issuemail: http://d.puremagic.com/issues/userprefs.cgi?tab=email ------- You are receiving this mail because: -------int(" 0123\n")
May 09 2010
http://d.puremagic.com/issues/show_bug.cgi?id=4165 A comment by Adam Ruppe:I don't think that's a bug. It should only worry about converting, not filtering out bad stuff. That's an orthogonal problem that the other function does well, and easily too.It's not a bug. But saying it's an orthogonal problem is not enough. You must keep a balance between having a so flexible language/stdlib that's sloppy and can lead to bugs, and to have as much orthogonal functions as possible that are fussy and can lead to opposite kinds of bugs. Often if I have to convert strings to numbers that have a leading newline. Converting such string with leading newline to a number is not sloppiness because my experience shows me it doesn't cause bugs in Python. The way to!() is currently designed forces me to remove the spaces often. This has caused a bug in one script-like D program. -- Configure issuemail: http://d.puremagic.com/issues/userprefs.cgi?tab=email ------- You are receiving this mail because: -------
May 22 2010
http://d.puremagic.com/issues/show_bug.cgi?id=4165 Lars T. Kyllingstad <bugzilla kyllingen.net> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |bugzilla kyllingen.net Severity|normal |enhancement 03:27:02 PDT --- Since we all agree this is not a bug, I'm marking it as an enhancement request. -- Configure issuemail: http://d.puremagic.com/issues/userprefs.cgi?tab=email ------- You are receiving this mail because: -------
Aug 13 2010
http://d.puremagic.com/issues/show_bug.cgi?id=4165 David Simcha <dsimcha yahoo.com> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|NEW |RESOLVED CC| |dsimcha yahoo.com Resolution| |WONTFIX I'm marking this as wontfix because it's by design (it's mentioned in the docs of std.conv), and there's a trivial workaround: int x = to!int(" 0123\n".strip()); -- Configure issuemail: http://d.puremagic.com/issues/userprefs.cgi?tab=email ------- You are receiving this mail because: -------
Aug 15 2010