大约有 40,000 项符合查询结果（耗时：0.0372秒） [XML]
In R, how to get an object's name after it is sent to a function?
...(mean.x)}
test(a)
#[1] "a" ... this is the side-effect of the print() call
# ... you could have done something useful with that character value
#[1] 5.5 ... this is the result of the function call
Edit: Ran it with the new test-object
Note: this will not succeed inside a local func...
Calling Java varargs method with single null argument?
If I have a vararg Java method foo(Object ...arg) and I call foo(null, null) , I have both arg[0] and arg[1] as null s. But if I call foo(null) , arg itself is null. Why is this happening?
...
C++ deprecated conversion from string constant to 'char*'
...you are doing somewhere (not in the code you posted) something like:
void foo(char* str);
foo("hello");
The problem is that you are trying to convert a string literal (with type const char[]) to char*.
You can convert a const char[] to const char* because the array decays to the pointer, but wha...
HAProxy redirecting http to https (ssl)
...lancing and only want my site to support https. Thus, I'd like to redirect all requests on port 80 to port 443.
15 Answers...
Detail change after Git pull
...ction of the git-rev-parse man page), so that you can do things like
See all of the changes: git diff master@{1} master
See the changes to a given file: git diff master@{1} master <file>
See all the changes within a given directory: git diff master@{1} master <dir>
See the summary of c...
Java's final vs. C++'s const
...on const instances. Java does not have an equivalent to this. E.g.:
class Foo {
public:
void bar();
void foo() const;
};
void test(const Foo& i) {
i.foo(); //fine
i.bar(); //error
}
Values can be assigned, once, later in Java only e.g.:
public class Foo {
void bar() {
...
jQuery - Create hidden form element on the fly
What is the simplest way to dynamically create a hidden input form field using jQuery?
6 Answers
...
Working with select using AngularJS's ng-options
...of the array item the option tag relates to. This is because AngularJS actually allows you to select entire objects with select controls, and not just primitive types. For example:
app.controller('MainCtrl', function($scope) {
$scope.items = [
{ id: 1, name: 'foo' },
{ id: 2, name: 'ba...
How to pass macro definition from “make” command line arguments (-D) to C source code?
I usually pass macro definitions from "make command line" to a "makefile" using the option :
-Dname=value. The definition is accessible inside the makefile.
...
Scala constructor overload?
...at the primary constructor is the sole point of entry to the class.
class Foo(x: Int, y: Int, z: String) {
// default y parameter to 0
def this(x: Int, z: String) = this(x, 0, z)
// default x & y parameters to 0
// calls previous auxiliary constructor which calls the primary cons...