问题原因其实很简单,就是没有对这个数组进行初始化操作,即当前只存在数组的声明,系统只为二维数组对象的引用变量分配了空间,并没有创建相应的数组对象 。那么在相关的方法中,自然无法对这个看似存在但实际却找不到影儿的数组进行操作,所以就会报错了。 解决办法 在类中再添加一个成员方法init(),给这个对象数组进行内...
I know how to code OOP and i also know pointers/references , C++ and so on. But I still use Java-styled code in C++ like always create Objects(verctor,class) with 'new' (Class c = new Class(); ) and i'm not sure if it's always necessary or good. ...
Now, over the years a few different styles have occured in C++, starting by C with Classes and heavily using pointers, to OOP Frameworks such as wxWidgets or Qt. The trend in the last 5-10 years has been towards a style called modern C++, a style that tries to use the language to ...
In C++, implement a recursive example in an OOP environment. 1) When passing an array to a function is it "by address" or "by value". Explain what happens and what is meant by the two terms. Write a function called my_str_n_cpy() that accepts pointer to a destinat...
If you are lucky, you may find a good tutorial on the web. But sharing our experience in the dev forums would be another good way. 0 Copy OOPer answer buggyOP Oct ’15 It worked! I thought I'd share the final code for anyone else who might come along. Here you go. ...
A long time ago, in a galaxy far, far away there was a widely used MFC library which had a few classes with methods that compared this pointer to null.
I am doing some OOP with unlimited polymorphic Fortran programming. I found a weird runtime error about memory, here is the extracted code: modulem1implicit nonetype::node class(*),pointer::item=>null()containsfinal::destructor procedure::node_printend typecontain...
A possible solution would be to redefine SOLVEODE in the derived class but this would be repetition of code that would have to be redefined in each extension if a change were made, which is against OOP principles. In summary, if I wish to achieve what I did in my original example with...
I have unintentionally raised a large debate recently concerning the question of whether it is legal in C/C++ to use the &P->m_foo expression with P being a null pointer. The programmers′ community...
10. “The most popular and developed model of OOP is a class-based model, as opposed to an object-based model. In this model, objects are entities that combine state (i.e., data), behavior (i.e., procedures, or methods) and identity (unique existence among all other objects). The ...