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#ifdef GNU_LINUX
#define __USE_GNU
#endif
========
问题解决
#include <netinet/in_systm.h>
[root@RS1 zebra-0.95a]# make install
Making install in lib
make[1]: Entering directory `/mnt/zebra-0.95a/lib'
make[2]: ...
What is the (function() { } )() construct in JavaScript?
...e it’s often used as this:
(function(){
// all your code here
var foo = function() {};
window.onload = foo;
// ...
})();
// foo is unreachable here (it’s undefined)
Correction suggested by Guffa:
The function is executed right after it's created, not after it is parsed. The enti...
Returning value from Thread
...
Usually you would do it something like this
public class Foo implements Runnable {
private volatile int value;
@Override
public void run() {
value = 2;
}
public int getValue() {
return value;
}
}
Then you can create the thread and...
Primary key or Unique index?
...lues in that column in two different rows. Example:
CREATE TABLE table1 (foo int, bar int);
CREATE UNIQUE INDEX ux_table1_foo ON table1(foo); -- Create unique index on foo.
INSERT INTO table1 (foo, bar) VALUES (1, 2); -- OK
INSERT INTO table1 (foo, bar) VALUES (2, 2); -- OK
INSERT INTO table1 (f...
Does python have an equivalent to Java Class.forName()?
... only refer to the top level module,
For example, if your class lives in foo.baz module, then m will be the module foo
We can easily obtain a reference to foo.baz using getattr( m, 'baz' )
To get from the top level module to the class, have to recursively use gettatr on the parts of the class nam...
Passing variables in remote ssh command
...ariables.
# The first one even contains whitespace and a newline.
readonly FOO=$'apjlljs ailsi \n ajlls\t éjij'
readonly BAR=ygnàgyààynygbjrbjrb
# Make a list of what you want to pass through SSH.
# (The “unset” is just in case someone exported
# an associative array with this name.)
unset ...
Dynamic constant assignment
...ject itself is different each time the method is called. For example:
def foo
p "bar".object_id
end
foo #=> 15779172
foo #=> 15779112
Perhaps if you explained your use case—why you want to change the value of a constant in a method—we could help you with a better implementation.
Per...
Operation on every pair of element in a list
...
my_list = [1,2,3,4]
for pair in itertools.product(my_list, repeat=2):
foo(*pair)
This is equivalent to:
my_list = [1,2,3,4]
for x in my_list:
for y in my_list:
foo(x, y)
Edit: There are two very similar functions as well, permutations() and combinations(). To illustrate how th...
Convert a string to regular expression ruby
...
"/[\w\s]+/".to_regexp => /[\w\s]+/
You also can use the modifier:
'/foo/i'.to_regexp => /foo/i
Finally, you can be more lazy using :detect
'foo'.to_regexp(detect: true) #=> /foo/
'foo\b'.to_regexp(detect: true) #=> %r{foo\\b}
'/foo\b/'.to_regexp(detect: true) #=> %r{f...
What is this weird colon-member (“ : ”) syntax in the constructor?
...tax (ala: new String("Name")). It fits in with the constructor better than Foo(int num) : m_Count = 5. Not to mention that classes must be constructed at this point anyway, since it's initialized here. Foo(int num) : Bar = num, wouldn't compile right. It just seems weird seeing Foo(int num) : m_Coun...