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Printing all global variables/local variables?
...
In case you want to see the local variables of a calling function use select-frame before info locals
E.g.:
(gdb) bt
#0 0xfec3c0b5 in _lwp_kill () from /lib/libc.so.1
#1 0xfec36f39 in thr_kill () from /lib/libc.so.1
#2 0xfebe3603 in raise () from /lib/libc.so.1
#3 0xfebc2961 in abort () f...
Creating an R dataframe row-by-row
...based file systems are a good example (which evolved from concepts such as union mounts, which also ply both sides).
If R Core wanted to do this, underlying vector storage could function like a union mount. One reference to the vector storage might be valid for subscripts 1:N, while another refe...
How to get the current time as datetime
...thing similar to let components = calendar.components(.NSCalendarUnit.Year.union(NSCalendarUnit.Minute), fromDate: date), the vertical slash cant be used here anymore.
– Hola Soy Edu Feliz Navidad
Jun 24 '15 at 19:09
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How do I use vim registers?
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@dotancohen Technically it's called PRIMARY selection, but I guess "mouse higlight" is easier for people to get :)
– kyrias
Nov 26 '13 at 16:45
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ROW_NUMBER() in MySQL
...asy, but actually it kind of isn't).
I often plump for a null-self-join:
SELECT t0.col3
FROM table AS t0
LEFT JOIN table AS t1 ON t0.col1=t1.col1 AND t0.col2=t1.col2 AND t1.col3>t0.col3
WHERE t1.col1 IS NULL;
“Get the rows in the table for which no other row with matching col1,col2 has a hi...
Why 0 is true but false is 1 in the shell?
...the same.
Also it needs to be expected that some people cast errno to char or short at some point, or even to float. (int)((char)ENOLCK) is not ENOLCK when char is not at least 8-bit long (7-bit ASCII char machines are supported by UNIX), while (int)((char)0) is 0 independent of the architectur...
Fastest way to iterate over all the chars in a String
In Java, what would the fastest way to iterate over all the chars in a String, this:
8 Answers
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C++ lambda with captures as a function pointer
...ector>
#include <functional>
using namespace std;
int ftw(const char *fpath, std::function<int (const char *path)> callback) {
return callback(fpath);
}
int main()
{
vector<string> entries;
std::function<int (const char *fpath)> callback = [&](const char *fpa...
How can I safely encode a string in Java to use as a filename?
...If collisions must be avoided, then simple replacement or removal of "bad" characters is not the answer either.
Instead you want something like this. (Note: this should be treated as an illustrative example, not something to copy and paste.)
char fileSep = '/'; // ... or do this portably.
char es...
What does the restrict keyword mean in C++?
... saved, as mentioned by supercat and michael.
Consider for example:
void f(char *restrict p1, char *restrict p2, size_t size) {
for (size_t i = 0; i < size; i++) {
p1[i] = 4;
p2[i] = 9;
}
}
Because of restrict, a smart compiler (or human), could optimize that to:
mem...