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What is Java String interning?
... share same memory. So if you have list of names where 'john' appears 1000 times, by interning you ensure only one 'john' is actually allocated memory.
This can be useful to reduce memory requirements of your program. But be aware that the cache is maintained by JVM in permanent memory pool which i...
How to get the number of characters in a std::string?
...UErrorCode status)
{
if(U_FAILURE(status))
{
throw std::runtime_error(u_errorName(status));
}
}
size_t countGraphemes(UText* text)
{
// source for most of this: http://userguide.icu-project.org/strings/utext
UErrorCode status = U_ZERO_ERROR;
PUBreakIterator it(ubrk_o...
How to shrink/purge ibdata1 file in MySQL
... localhost as a "query tool" for performing statistics in R, that is, everytime I run a R script, I create a new database (A), create a new table (B), import the data into B, submit a query to get what I need, and then I drop B and drop A.
...
Is it possible to use 'else' in a list comprehension? [duplicate]
...re not inherently computationally efficient. It is still running in linear time.
From my personal experience:
I have significantly reduced computation time when dealing with large data sets by replacing list comprehensions (specifically nested ones) with for-loop/list-appending type structures you ...
What do Clustered and Non clustered index actually mean?
...have many non clustered indices, although each new index will increase the time it takes to write new records.
It is generally faster to read from a clustered index if you want to get back all the columns. You do not have to go first to the index and then to the table.
Writing to a table with a c...
Does Android support near real time push notification?
...using GCM SDKs today to handle notifications, and client app upgrade takes time.
As of June 26, 2012, Google Cloud Messaging is the preferred way of sending messages to applications running on devices.
Previously (and now deprecated), the service was called Cloud To Device Messaging.
...
What is the ellipsis (…) for in this method signature?
...e:
void process(String[] s){}
void process(String...s){}
then a compile-time error occurs.
Source: The Java Programming Language specification, where the technical term is variable arity parameter rather than the common term varargs.
...
Can Git hook scripts be managed along with the repository?
...ile is set to copy to the build directory. Thus the project is build every time and is never skipped. In the build event, it also makes sure that all git hooks are in place.
Note that this is not a general solution, as some projects, of course, have nothing to build.
...
Sorting a vector of custom objects
...ng the ordering logic which might be a severe drawback (at least when link time optimization/code generation is not applied).
Ways to achieve comparability of class X in order to use standard library sorting algorithms
Let std::vector<X> vec_X; and std::vector<Y> vec_Y;
1. Overload T:...
Objective-C: Reading a file line by line
...);
This code reads non-newline characters from the file, up to 4095 at a time. If you have a line that is longer than 4095 characters, it keeps reading until it hits a newline or end-of-file.
Note: I have not tested this code. Please test it before using it.
...