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What is the meaning of prepended double colon “::”?
...lls your compiler to look in the global namespace for the type.
Example:
int count = 0;
int main(void) {
int count = 0;
::count = 1; // set global count to 1
count = 2; // set local count to 2
return 0;
}
sha...
Ant: How to execute a command for each file in directory?
...is evil; write a custom ant task.
ant-contrib is evil because it tries to convert ant from a declarative style to an imperative style. But xml makes a crap programming language.
By contrast a custom ant task allows you to write in a real language (Java), with a real IDE, where you can write unit t...
Java: getMinutes and getHours
...er API for handling dates.
DateTime dt = new DateTime(); // current time
int month = dt.getMonth(); // gets the current month
int hours = dt.getHourOfDay(); // gets hour of day
See this question for pros and cons of using Joda Time library.
Joda Time may also be included to some future ver...
Using a 'using alias = class' with generic types? [duplicate]
....B; // Error, cannot name unbound generic type
using Y = N1.A<int>; // Ok, can name closed constructed type
using Z<T> = N1.A<T>; // Error, using alias cannot have type parameters
}
shar...
Is there an easy way to return a string repeated X number of times?
...
If you only intend to repeat the same character you can use the string constructor that accepts a char and the number of times to repeat it new String(char c, int count).
For example, to repeat a dash five times:
string result = new St...
Log all queries in mysql
... `query_time` time NOT NULL,
`lock_time` time NOT NULL,
`rows_sent` int(11) NOT NULL,
`rows_examined` int(11) NOT NULL,
`db` varchar(512) NOT NULL,
`last_insert_id` int(11) NOT NULL,
`insert_id` int(11) NOT NULL,
`server_id` int(10) unsigned NOT NULL,
`sql_text` mediumtext N...
Using async/await for multiple tasks
...
int[] ids = new[] { 1, 2, 3, 4, 5 };
Parallel.ForEach(ids, i => DoSomething(1, i, blogClient).Wait());
Although you run the operations in parallel with the above code, this code blocks each thread that each operation run...
Programmatically retrieve memory usage on iPhone
... anytime, programmatically. Yes I'm aware about ObjectAlloc/Leaks. I'm not interested in those, only to know if it's possible to write some code and get the amount of bytes being used and report it via NSLog.
...
HashSet versus Dictionary w.r.t searching time to find if an item exists
...cause it gives you what you want: storing a set of values (as opposed to maintaining some kind of mapping). This answer indicates that there will be no negative impact on performance compared to Dictionary.
– Francois Beaussier
Apr 7 '17 at 6:38
...
calculating the difference in months between two dates
...letely disregarding the date values--then you can use this:
public static int MonthDifference(this DateTime lValue, DateTime rValue)
{
return (lValue.Month - rValue.Month) + 12 * (lValue.Year - rValue.Year);
}
Note that this returns a relative difference, meaning that if rValue is greater tha...