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Why is “while ( !feof (file) )” always wrong?
...t * p = buf;
ssize_t n = bufsize;
for (ssize_t k = bufsize; (k = write(fd, p, n)) > 0; p += k, n -= k) {}
if (n != 0) { /* error, failed to write complete buffer */ }
The result we use here is k, the number of bytes written. The point here is that we can only know how many bytes were wri...
Command not found error in Bash variable assignment
...
You cannot have spaces around your '=' sign.
When you write:
STR = "foo"
bash tries to run a command named STR with 2 arguments (the strings '=' and 'foo')
When you write:
STR =foo
bash tries to run a command named STR with 1 argument (the string '=foo')
When you write:
STR= foo
bas...
Ruby regular expression using variable name
...n't work, does:
var = "Value"
str = "a test Value"
p str.gsub( /#{var}/, 'foo' ) # => "a test foo"
Things get more interesting if var can contain regular expression meta-characters. If it does and you want those matacharacters to do what they usually do in a regular expression, then the sam...
How to pass command line argument to gnuplot?
I want to use gnuplot to draw figure from data file, say foo.data . Currently, I hardcoded the data file name in the command file, say foo.plt , and run command gnuplot foo.plg to plot data. However, I want to pass the data file name as a command argument, e.g. running command gnuplot foo.plg f...
What does T&& (double ampersand) mean in C++11?
...y implementations.
For example, a copy constructor might look like this:
foo(foo const& other)
{
this->length = other.length;
this->ptr = new int[other.length];
copy(other.ptr, other.ptr + other.length, this->ptr);
}
If this constructor was passed a temporary, the copy w...
Remove the last line from a file in Bash
I have a file, foo.txt , containing the following lines:
14 Answers
14
...
How do I define global variables in CoffeeScript?
... as properties on window
This means you need to do something like window.foo = 'baz';, which handles the browser case, since there the global object is the window.
Node.js
In Node.js there's no window object, instead there's the exports object that gets passed into the wrapper that wraps the Nod...
How does the @property decorator work in Python?
... the @decorator syntax is just syntactic sugar; the syntax:
@property
def foo(self): return self._foo
really means the same thing as
def foo(self): return self._foo
foo = property(foo)
so foo the function is replaced by property(foo), which we saw above is a special object. Then when you use @...
A regex to match a substring that isn't followed by a certain other substring
I need a regex that will match blahfooblah but not blahfoobarblah
5 Answers
5
...
How to initialize private static members in C++?
... should be in the header file (Or in the source file if not shared).
File: foo.h
class foo
{
private:
static int i;
};
But the initialization should be in source file.
File: foo.cpp
int foo::i = 0;
If the initialization is in the header file then each file that includes the header ...