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c++ boost::multi_index composite keys efficiency - c++1y / stl - 清泛IT社区，为创新赋能！
...-depth question that hopefully a boost or C++ container expert might know (my knowledge in C++ containers is pretty basic). For reference, the boost documentation on composite keys can be found here: boost::multi_index composite keys.When using a composite key, the documentation states that "Co...
@import vs #import - iOS 7
...actually it looks like @import sqlite3 worked for me because I had created my own module.map for it and when I realized sqlite was included in OS X and removed my module.map, the compiler continued using the stale module.
– bames53
Nov 21 '13 at 14:25
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Can you “compile” PHP code and upload a binary-ish file, which will just be run by the byte code int
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What about Shared web host? Could I compile my PHP script with one of those compilers and then upload to my linux based web host?
– SaidbakR
May 14 '13 at 20:37
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How to set working/current directory in Vim?
...l change to the directory of the file you opened, the other option is
:cd mydirectory
which will change the directory. This can be an absolute or relative path, so :cd .. will move up one level. Or you can use :cd %:h which will also change to the directory the current file is in, but without set...
DateTime.Now vs. DateTime.UtcNow
...t know UtcNow has better performance and that simply saving your dates in mysql and assuming that is utc and comparing date dependent displays with UtcNow simplifies this global timezone issues
– Diin
May 14 '19 at 16:48
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Can you provide some examples of why it is hard to parse XML and HTML with a regex? [closed]
...tion of valid and invalid. Your invalid XML/HTML is not highlighted, while my corrected version is.
Basically, XML is not made to be parsed with regexps. But there is also no reason to do so. There are many, many XML parsers for each and every language. You have the choice between SAX parsers, DOM ...
API Versioning for Rails Routes
I'm trying to version my API like Stripe has. Below is given the latest API version is 2.
7 Answers
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creating a random number using MYSQL
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NOTE: I dont have a column named 'number' in my db. This must be dynamically generated column. is it posible?
– TNK
Feb 10 '13 at 14:24
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How to set enum to null
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You can either use the "?" operator for a nullable type.
public Color? myColor = null;
Or use the standard practice for enums that cannot be null by having the FIRST value in the enum (aka 0) be the default value. For example in a case of color None.
public Color myColor = Color.None;
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Close and Dispose - which to call?
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@DavidHammond: You're right. I'm deleting my previous comment.
– NotMe
Dec 15 '11 at 23:49
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