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How do I create delegates in Objective-C?
... didFinishLoadingItem:(id)item;
- (void)something:(id)something didFailWithError:(NSError *)error;
@end
@interface Something : NSObject
@property (nonatomic, weak) id <SomethingDelegate> delegate;
@end
@implementation Something {
struct {
unsigned int didFinishLoadingItem:1;
unsign...
Request is not available in this context
...s not available in this
context” exception is one of the more
common errors you may receive on when
moving ASP.NET applications to
Integrated mode on IIS 7.0. This
exception happens in your
implementation of the
Application_Start method in the
global.asax file if you attempt to
...
Variable's scope in a switch case [duplicate]
...nclose both declarations of the variables which will cause the compiler to error as the name to variable binding will have already been made.
In the other example it is ok because both variables are declared within their own braces (scope).
...
Do you need to dispose of objects and set them to null?
...l = 5;
//iVal == 5
}
//iVal == 8
In C#, however you get a a compiler error:
int iVal = 8;
if(iVal == 8) {
int iVal = 5; //error CS0136: A local variable named 'iVal' cannot be declared in this scope because it would give a different meaning to 'iVal', which is already used in a 'parent or...
return statement vs exit() in main()
...
abort() exits with error condition (non-zero exit code) and may be even a core. If you need to exit w/o calling static destructors, use _exit .
– user3458
Jan 20 '09 at 14:46
...
How can I propagate exceptions between threads?
...his_thread::sleep_for(std::chrono::seconds(1));
throw std::runtime_error("To be passed between threads");
}
catch(...)
{
teptr = std::current_exception();
}
}
int main(int argc, char **argv)
{
std::thread mythread(f);
mythread.join();
if (teptr) {
...
Expand/collapse section in UITableView in iOS
...t as soon as i had more, i get the "invalid update invalid number of rows" error. i know this solution is older, but will this only work for one section? if we have more than one section, will we need to add the code that actually adds/deletes the rows??
– skinsfan00atg
...
How to convert an enum type variable to a string?
...n an array, and to set the compiler switches in the build file to issue an error for a switch over an enum that doesn't cover all possible values. Adding a new enum entry without updating the relevant switch statements will cause a compilation error.
– divegeek
...
Disable password authentication for SSH [closed]
...d ~/.ssh
Enter rm -rf authorized_keys (sometimes multiple keys lead to an error).
Enter vi authorized_keys
Enter :wq to save this empty file
Enter cat ~/.ssh/id_rsa.pub >> ~/.ssh/authorized_keys
Restart the SSH:
sudo launchctl stop com.openssh.sshd
sudo launchctl start com.openssh.sshd
...
C++静态和多态，亦敌亦友 - C/C++ - 清泛网 - 专注C/C++及内核技术
...代码编译不能通过。显示如下信息：
stawithvir.cpp:19:17: error: ‘static void DerivedAgain::foo()’ cannot be declared
stawithvir.cpp:13:10: error: since ‘virtual void Derived::foo()’ declared in base class
很明显，编译不能通过的原因，是在De...