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What is the preferred/idiomatic way to insert into a map?
I have identified four different ways of inserting elements into a std::map :
9 Answers
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What is the difference between the kernel space and the user space?
...ernel space in order to stop the users from messing up with the kernel, unknowingly.
So, when a system call occurs, a software interrupt is sent to the kernel. The CPU may hand over the control temporarily to the associated interrupt handler routine. The kernel process which was halted by the inter...
If table exists drop table then create it, if it does not exist just create it
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Just put DROP TABLE IF EXISTS `tablename`; before your CREATE TABLE statement.
That statement drops the table if it exists but will not throw an error if it does not.
s...
Why does int i = 1024 * 1024 * 1024 * 1024 compile without error?
...A VALUE(although 2147483648L is) in Java. The compiler literally does not know what it is, or how to use it. So it whines.
1024 is a valid int in Java, and a valid int multiplied by another valid int, is always a valid int. Even if it's not the same value that you would intuitively expect because t...
Split a string by another string in C#
...e it suddenly drags my attention from stream level to byte level. Anybody know why C# library guys designed the Split method like this? If there is a good reason, I can probably try to appreciate it despite the inconvenience.
– foresightyj
Jan 23 '15 at 5:24
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pretty-print JSON using JavaScript
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Pretty-printing is implemented natively in JSON.stringify(). The third argument enables pretty printing and sets the spacing to use:
var str = JSON.stringify(obj, null, 2); // spacing level = 2
If you need syntax highlighting, you might use some regex magic like so:
function...
What is the argument for printf that formats a long?
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Yep Dr Beco; further, just %l triggers warning: unknown conversion type character 0x20 in format [-Wformat]
– Patrizio Bertoni
Jul 29 '15 at 10:53
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Why aren't variables declared in “try” in scope in “catch” or “finally”?
...u be sure, that you reached the declaration part in your catch block? What if the instantiation throws the exception?
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Count how many files in directory PHP
...eople are saying this is confusing for some developers, should we add that if one is using namespaces (since this method requires a recent version of PHP in any case), then one must also specify the namespace: $fi = new \FilesystemIterator(DIR, \FilesystemIterator::SKIP_DOTS);
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How to provide user name and password when connecting to a network share
...efer the latter, as I sometimes need to maintain multiple credentials for different locations. I wrap it into an IDisposable and call WNetCancelConnection2 to remove the creds afterwards (avoiding the multiple usernames error):
using (new NetworkConnection(@"\\server\read", readCredentials))
using ...