[Issue 11807] New: Functions to attempt string-to-T conversions (a la C#'s TryParse)

[d-bugmail at puremagic.com]

https://d.puremagic.com/issues/show_bug.cgi?id=11807

           Summary: Functions to attempt string-to-T conversions (a la
                    C#'s TryParse)
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Phobos
        AssignedTo: nobody at puremagic.com
        ReportedBy: peter.alexander.au at gmail.com


--- Comment #0 from Peter Alexander <peter.alexander.au at gmail.com> 2013-12-23 11:40:23 PST ---
std.conv provides 'to' and 'parse', but both will throw exceptions if they fail
to convert. The only way to test if a conversion is possible is to call these
functions and catch the exception. This isn't a great situation because
throwing exceptions is not good for performance.

This enhancement requests something akin to C#'s TryParse, which returns a
boolean false if the conversion failed and returns the converted value as an
out parameter. Like this:

bool tryParse(T)(string s, out T value)

An alternative API would be to return a Nullable!T

See Also:
http://msdn.microsoft.com/en-us/library/f02979c7(v=vs.110).aspx

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