constructor

问题 This Question / Answer (Python call constructor in a member function) says it is possible to to call the constructor from within a member function. How do I do that? Is it good a style? I tried it with the following code: class SomeClass(object): def __init__(self, field): self.field = field def build_new(self): self = SomeClass(True) def main(): inst = SomeClass(False) inst.build_new() print(inst.field) if __name__ == '__main__': main() As output I get: False Since I called the build_new()

问题 This Question / Answer (Python call constructor in a member function) says it is possible to to call the constructor from within a member function. How do I do that? Is it good a style? I tried it with the following code: class SomeClass(object): def __init__(self, field): self.field = field def build_new(self): self = SomeClass(True) def main(): inst = SomeClass(False) inst.build_new() print(inst.field) if __name__ == '__main__': main() As output I get: False Since I called the build_new()

问题 My understanding, for instance reading this, is that the constructor of a derived class does not call its virtual base class' constructor. Here is a simple example I made: class A { protected: A(int foo) {} }; class B: public virtual A { protected: B() {} }; class C: public virtual A { protected: C() {} }; class D: public B, public C { public: D(int foo, int bar) :A(foo) {} }; int main() { return 0; } For some reason, the constructors B::B() and C::C() are trying to initialize A (which, again

问题 My understanding, for instance reading this, is that the constructor of a derived class does not call its virtual base class' constructor. Here is a simple example I made: class A { protected: A(int foo) {} }; class B: public virtual A { protected: B() {} }; class C: public virtual A { protected: C() {} }; class D: public B, public C { public: D(int foo, int bar) :A(foo) {} }; int main() { return 0; } For some reason, the constructors B::B() and C::C() are trying to initialize A (which, again

问题 I want to be able to construct an object from inside a generic function. I tried the following: abstract class Interface { Interface.func(int x); } class Test implements Interface { Test.func(int x){} } T make<T extends Interface>(int x) { // the next line doesn't work return T.func(x); } However, this doesn't work. And I get the following error message: The method 'func' isn't defined for the class 'Type' . Note : I cannot use mirrors because I'm using dart with flutter. 回答1: Dart does not

来源： https://stackoverflow.com/questions/28653316/error-lnk2019-unresolved-external-symbol-public-thiscall-constructor-issu

来源： https://stackoverflow.com/questions/28653316/error-lnk2019-unresolved-external-symbol-public-thiscall-constructor-issu

来源： https://stackoverflow.com/questions/28653316/error-lnk2019-unresolved-external-symbol-public-thiscall-constructor-issu

来源： https://stackoverflow.com/questions/64402009/three-js-three-deviceorientationcontrols-is-not-a-constructor

来源： https://stackoverflow.com/questions/54446458/difference-on-initializing-object-inside-class-declaration-v-s-constructor