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Awkward way of executing JavaScript code [duplicate]
...
var a = (function() {
return foo(bar);
})();
In this case this is really unnecessary, but this is not wrong and it will not throw an error.
But IIF some times uses like module pattern:
var a = (function() {
/* some other code in own scope */
retu...
Boost智能指针——shared_ptr - C/C++ - 清泛网 - 专注C/C++及内核技术
...st文档上特地注明的标准bad Practices）：
void test()
{
foo(boost::shared_ptr<implementation>(new implementation()), g());
}
正确的用法为：
void test()
{
boost::shared_ptr<implementation> sp(new implementation());
foo(sp, g());
}
shared_ptr 智能指...
/usr/include/c++/4.9/bits/stl_iterator_base_types.h:165:53: error: ‘i...
...e[1])
或者将distance放在一个命名空间中,例如：
namespace foo
{
double distance(int a, int b)
{
return fabs(a-b);
}
}
int main()
{
foo::distance(x,y); //now you're calling your own distance function.
}
或者不使用命名空间std,显式声明std::vector...
How can I position my div at the bottom of its container?
...s absolute or relatively position in order to determine it's position. If all fails it resorts to body (window). So hence the need for the parent to be relative.
– user17753
Jun 13 '12 at 18:46
...
Spring @Autowired usage
...n having a "centralized, declarative, configuration" like the xml files we all used to use. Then I realized that most of the stuff in the files wasn't configuration - it was never changed anywhere after development, ever. Then I realized that "centralized" only has value in quite small systems - onl...
How can I add a boolean value to a NSDictionary?
...NO / @YES if you are declaring it as a literal. E.g.
NSMutableDictionary* foo = [@{ @"key": @NO } mutableCopy];
foo[@"bar"] = @YES;
For more info on that:
http://clang.llvm.org/docs/ObjectiveCLiterals.html
share
...
Difference between static class and singleton pattern?
...s you say that either a singleton or a static method isn't thread-safe? Usually both should be implemented to be thread-safe.
The big difference between a singleton and a bunch of static methods is that singletons can implement interfaces (or derive from useful base classes, although that's less co...
How do you properly use namespaces in C++?
...
Namespaces are packages essentially. They can be used like this:
namespace MyNamespace
{
class MyClass
{
};
}
Then in code:
MyNamespace::MyClass* pClass = new MyNamespace::MyClass();
Or, if you want to always use a specific namespace, you can d...
Which is faster: Stack allocation or Heap allocation
...
Stack allocation is much faster since all it really does is move the stack pointer.
Using memory pools, you can get comparable performance out of heap allocation, but that comes with a slight added complexity and its own headaches...
What is the difference between null and undefined in JavaScript?
...he typeof operator returns 'object' for a value that is null. This was actually an error in the original JavaScript implementation that was then copied in ECMAScript. Today, it is rationalized that null is considered a placeholder for an object, even though, technically, it is a primitive value."
...