- Optimal std::map Key - 2 Updates
- initialization - 1 Update
- convert to a time and compaire to see if more than a minute difference found? - 1 Update
- Would std::runtime_error benefit from having another constructor? - 1 Update
| MikeCopeland <mrc2323@cox.net>: Apr 06 03:34PM -0700 I have an std::map with a key that's quite large. The key data is comprised of numeric digits, so I can use either unsigned long or basic::string as the key type. The data range isn't sparse (371920945, 387731336, 388604385, 392868398, etc.). My concern is that with such a large key (as string type), would the map processing be significantly more efficient if the type for the key is declared as "unsigned long"...or does it not matter? TIA --- This email has been checked for viruses by Avast antivirus software. http://www.avast.com |
| Ian Collins <ian-news@hotmail.com>: Apr 07 10:45AM +1200 MikeCopeland wrote: > a large key (as string type), would the map processing be significantly > more efficient if the type for the key is declared as "unsigned > long"...or does it not matter? TIA Why would you represent a numeric key as a string? -- Ian Collins |
| David Brown <david.brown@hesbynett.no>: Apr 06 11:53PM +0200 On 29/03/15 04:51, Öö Tiib wrote: >> without having set it. > Compilers do not typically warn if you pass uninitialied variable to > function by non-const reference or pointer. Just because compilers can't check /everything/, does not mean you should ignore the checks they /can/ do! But I agree that sometimes using an "unavailable" or known-bad value is a good choice for initialisation when you don't have a real valid value. |
| scott@slp53.sl.home (Scott Lurndal): Apr 06 01:40PM >I'm parsing a few million lines of log files and trying to sort things out. >My log files begin with stuff like: >2015-03-23 11:56:03,752 On a posix platform, use 'strptime'. |
| woodbrian77@gmail.com: Apr 05 08:02PM -0700 On Sunday, April 5, 2015 at 4:41:00 PM UTC-5, Öö Tiib wrote: > To my knowledge that has changed since C++11 and now > 'std::runtime_error' has two constructors, one that > takes 'std::string const&' and other that takes 'char const*'. OK. I thought I was looking at the documentation for C++ 2011, but it was the 1998 documentation. Sorry about that. Maybe I'll start using cppreference.com more. Brian Ebenezer Enterprises http://webEbenezer.net |
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