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How to change string into QString?
...QString::fromStdString(str);
If by string you mean Ascii encoded const char * then you can use this method:
QString QString::fromAscii(const char * str, int size = -1)
const char* str = "Hello world";
QString qstr = QString::fromAscii(str);
If you have const char * encoded with system enco...
What is the Java string pool and how is “s” different from new String(“s”)? [duplicate]
...: String s = GlobalStringObjectCache.get("hello");
– Charles Goodwin
May 30 '16 at 12:07
7
Copy-p...
How can I get the behavior of GNU's readlink -f on a Mac?
...es, sys
libc = ctypes.CDLL('libc.dylib')
libc.realpath.restype = ctypes.c_char_p
libc.__error.restype = ctypes.POINTER(ctypes.c_int)
libc.strerror.restype = ctypes.c_char_p
def realpath(path):
buffer = ctypes.create_string_buffer(1024) # PATH_MAX
if libc.realpath(path, buffer):
ret...
C/C++ NaN constant (literal)?
...> offers the below functions:
#include <math.h>
double nan(const char *tagp);
float nanf(const char *tagp);
long double nanl(const char *tagp);
which are like their strtod("NAN(n-char-sequence)",0) counterparts and NAN for assignments.
// Sample C code
uint64_t u64;
double x;
x = nan("0...
How do I repeat an edit on multiple lines in Vim?
...al block by using
" allow the . to execute once for each line of a visual selection
vnoremap . :normal .<CR>
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const char * const versus const char *?
...ally be appropriate here, but perhaps the verbosity put off the developer.
char* the_string : I can change which char the_string points to, and I can modify the char to which it points.
const char* the_string : I can change which char the_string points to, but I cannot modify the char to which it po...
Store boolean value in SQLite
...TO foo VALUES("0.0");
sqlite> INSERT INTO foo VALUES("1.0");
sqlite> select mycolumn, typeof(mycolumn) from foo;
0|integer
1|integer
0|integer
1|integer
0|integer
1|integer
and some that will fail:
sqlite> INSERT INTO foo VALUES("-1");
Error: constraint failed
sqlite> INSERT INTO foo ...
Efficient way to remove ALL whitespace from String?
... IsExistingWorkspace() method. Since all workspaces consist of contiguous characters with no whitespace, I'm assuming the easiest way to find out if a particular workspace is in the list is to remove all whitespace (including newlines) and doing this (XML is the string received from the web request...
How many GCC optimization levels are there?
...?
integral_argument also thinly wraps atoi and rejects the argument if any character is not a digit. So negative values fail gracefully.
Back to opts.c:default_options_optimization, we see the line:
if ((unsigned int) opts->x_optimize > 255)
opts->x_optimize = 255;
so that the optimizati...
strdup() - what does it do in C?
...'s a POSIX thing), it's effectively doing the same as the following code:
char *strdup(const char *src) {
char *dst = malloc(strlen (src) + 1); // Space for length plus nul
if (dst == NULL) return NULL; // No memory
strcpy(dst, src); // Copy the characters...