oop

问题 Just recently discovered about using get and set keywords for class properties I was wondering what is the preferred method when using get / set for typescript classes: class example { private a: any; private b: any; getA(): any{ return this.a; } setA(value: any){ this.a = value; } get b(): any{ return this.b; } set b(value: any){ this.b = value; } } I am just curious if there are any best practices, performance, or other factors. 回答1: Getter and Setters have several uses, like You can make a

问题 I'm trying to understand a bit how Python (2.6) deals with class, instances and so on, and at a certain point, I tried this code: #/usr/bin/python2.6 class Base(object): default = "default value in base" def __init__(self): super(Base, self).__init__() @classmethod def showDefaultValue(cls, defl = default): print "defl == %s" % (defl) class Descend(Base): default = "default value in descend" def __init__(self): super(Descend, self).__init__() if __name__ == "__main__": Descend

问题 I am building application which needs to have OOP style MySQL query builder. I want to be able to flexibly build complex queries using only PHP and to get resulting query string for execution with my own database driver. Does anyone know of a good standalone query builder for PHP? Please note that I don't need database driver I need bare MySQL query builder class (preferably written with camel style function and variable names). 回答1: Finally I took Doctrine ORM and modified it little bit to

问题 This question already has answers here : When should static_cast, dynamic_cast, const_cast and reinterpret_cast be used? (9 answers) Closed 6 years ago . In C++ we can convert child class pointer to parent, but is there any way to convert it back: from parent, which was obtained from child, give child class back? I mean: class Parent { ... }; class Child : public Parent { ... }; int main(int argc, char const *argv[]) { Child* child = new Child(); Parent* parent = child; Child* old_child =

问题 This question already has answers here : When should static_cast, dynamic_cast, const_cast and reinterpret_cast be used? (9 answers) Closed 6 years ago . In C++ we can convert child class pointer to parent, but is there any way to convert it back: from parent, which was obtained from child, give child class back? I mean: class Parent { ... }; class Child : public Parent { ... }; int main(int argc, char const *argv[]) { Child* child = new Child(); Parent* parent = child; Child* old_child =

问题 class Foo(object): pass foo = Foo() def bar(self): print 'bar' Foo.bar = bar foo.bar() #bar Coming from JavaScript, if a "class" prototype was augmented with a certain attribute. It is known that all instances of that "class" would have that attribute in its prototype chain, hence no modifications has to be done on any of its instances or "sub-classes". In that sense, how can a Class-based language like Python achieve Monkey patching? 回答1: The real question is, how can it not? In Python,

问题 class Foo(object): pass foo = Foo() def bar(self): print 'bar' Foo.bar = bar foo.bar() #bar Coming from JavaScript, if a "class" prototype was augmented with a certain attribute. It is known that all instances of that "class" would have that attribute in its prototype chain, hence no modifications has to be done on any of its instances or "sub-classes". In that sense, how can a Class-based language like Python achieve Monkey patching? 回答1: The real question is, how can it not? In Python,

问题 class Foo(object): pass foo = Foo() def bar(self): print 'bar' Foo.bar = bar foo.bar() #bar Coming from JavaScript, if a "class" prototype was augmented with a certain attribute. It is known that all instances of that "class" would have that attribute in its prototype chain, hence no modifications has to be done on any of its instances or "sub-classes". In that sense, how can a Class-based language like Python achieve Monkey patching? 回答1: The real question is, how can it not? In Python,

问题 I've been trying to transform some cuda/C code into a more OO code, but my goal doesn't seem to be easy to achieve for my current understanding of the cuda functioning mechanism. I haven't been able to find good a explanation either on this situation. It might not be possible after all. I have a global object of class myClass holding an array to be filled in a kernel. How should the methods in myClass be defined so that the array and boolean members are visible from device and the array can

问题 I'm attempting to create an array of objects in php and was curious how I would go about that. Any help would be great, thanks! Here is the class that will be contained in the array <?php class hoteldetails { private $hotelinfo; private $price; public function sethotelinfo($hotelinfo){ $this->hotelinfo=$hotelinfo; } public function setprice($price){ $this->price=$price; } public function gethotelinfo(){ return $hotelinfo; } public function getprice(){ return $price; } } And here is what I am