用于解决错误的方法：“不能实例化抽象类” [英] Method for solving error: "cannot instantiate abstract class"

问题描述

我发现对我来说最耗时的编译器错误之一是无法实例化抽象类，因为问题总是我不打算让类抽象，编译器不列出哪些函数是抽象的。有一个更聪明的方法来解决这些比阅读头10次，直到我终于注意到一个丢失的const某处。

I find one of the most time-consuming compiler errors for me is "cannot instantiate abstract class," since the problem is always that I didn't intend for the class to be abstract and the compiler doesn't list which functions are abstract. There's got to be a more intelligent way to solve these than reading the headers 10 times until I finally notice a missing "const" somewhere. How do you solve these?

推荐答案

无法实例化抽象类

cannot instantiate abstract class

根据这个错误，我的猜测是你使用的是Visual Studio（因为这是Visual C ++说，当你试图实例化一个抽象类）。

Based on this error, my guess is that you are using Visual Studio (since that's what Visual C++ says when you try to instantiate an abstract class).

查看Visual Studio输出窗口（View => Output）;输出应该包含错误后的语句陈述：

Look at the Visual Studio Output window (View => Output); the output should include a statement after the error stating:

stubby.cpp(10) : error C2259: 'bar' : cannot instantiate abstract class
due to following members:
'void foo::x(void) const' : is abstract
stubby.cpp(2) : see declaration of 'foo::x'

（这是bdonlan的示例代码给出的错误）

(That is the error given for bdonlan's example code)

在Visual Studio中，错误列表窗口只显示错误消息的第一行。

In Visual Studio, the "Error List" window only displays the first line of an error message.

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