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What are all the common undefined behaviours that a C++ programmer should know about? [closed]
...mount greater than or equal to the number of bits in the number (e.g. int64_t i = 1; i <<= 72 is undefined)
Types, Cast and Const
Casting a numeric value into a value that can't be represented by the target type (either directly or via static_cast)
Using an automatic variable before it has b...
Socket.IO Authentication
... redisclient.get(message.rediskey, function(e, c) {
client.user_logged_in = c.username;
});
}
});
});
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Generating a drop down list of timezones with PHP
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I would do it in PHP, except I would avoid doing preg_match 100 some times and do this to generate your list.
$tzlist = DateTimeZone::listIdentifiers(DateTimeZone::ALL);
Also, I would use PHP's names for the 'timezones' and forget about GMT offsets, which will change based o...
What are Vertex Array Objects?
...is first bound, you assign these members by calling
glEnableClientState(GL_VERTEX_ARRAY); glVertexPointer...;
glEnableClientState(GL_NORMAL_ARRAY); glNormalPointer...;
and so on. Which attributes are enabled and the pointers you supply are stored in the VAO.
After that when you bind the VAO agai...
Vim: Creating parent directories on save
...move my previous options and give feedback.
– moebius_eye
Sep 3 '16 at 14:28
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Is there any advantage of using map over unordered_map in case of trivial keys?
A recent talk about unordered_map in C++ made me realize that I should use unordered_map for most cases where I used map before, because of the efficiency of lookup ( amortized O(1) vs. O(log n) ). Most times I use a map, I use either int or std::string as the key type; hence, I've got...
What does cmd /C mean? [closed]
...here's also a command to "pause" the cmd window after output: "cmd /c file_name & PAUSE" it is bit different from cmd /k
– Gourav
Sep 5 '15 at 19:34
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What resources exist for Database performance-tuning? [closed]
...tabase, this guide may also help.
http://download.oracle.com/docs/cd/B28359_01/server.111/b28274/toc.htm
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How to remove not null constraint in sql server using query
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or you can do : alter table table_name modify column_name type(30) NULL. 30 being the size of your column type, example: varchar(30)
– nr5
Sep 19 '12 at 18:11
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Escape string for use in Javascript regex [duplicate]
...ble here:
// https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/regexp
// these characters should be escaped
// \ ^ $ * + ? . ( ) | { } [ ]
// These characters only have special meaning inside of brackets
// they do not need to be escaped, but they MAY be escaped
// wit...