C++:警告:C4930:未调用原型函数(是否打算定义变量?)

C++: warning: C4930: prototyped function not called (was a variable definition intended?)(C++:警告:C4930:未调用原型函数(是否打算定义变量?))

本文介绍了C++:警告:C4930:未调用原型函数(是否打算定义变量?)的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

问题描述

我有一个没有默认构造函数的类,我创建了一个变量而没有错误地提供参数,但不是一个很好的编译器错误,而是一个链接器错误,我不能't 找到导致它的代码行.

I have a class that does not have a default constructor, I created a variable without giving parameters by mistake, but instead of a nice compiler error, I got a linker error, where I couldn't find the line of code that was causing it.

最后,我设法找到了导致这种情况的代码,直到那时我才注意到我收到了这个警告:

In the end, I managed to find the code that caused this, and only then I noticed that I was getting this warning:

C++: warning: C4930: prototyped function not called (was a variable definition intended?)

奇怪的是当我更改代码时:

What's weird is when I changed the code from:

MyClass foo();

MyClass foo;

我确实遇到了编译器错误.

I did get a compiler error.

谁能给我解释一下为什么编译器突然开始奇怪了,是bug还是什么?

Can someone explain to me why the compiler suddenly started acting strange, is it a bug or something?

推荐答案

这个

MyClass foo();

是返回类型为 MyClass 且不接受参数的函数声明..

is a function declaration that has return type MyClass and does not accept arguments..

这个

MyClass foo;

是一个对象定义.由于您的类 MyClass 没有默认构造函数,因此编译器会发出错误.

is an object definition. As your class MyClass has no the default constructor the compiler issues an error.

这篇关于C++:警告:C4930:未调用原型函数(是否打算定义变量?)的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持编程学习网!

本文标题为:C++:警告:C4930:未调用原型函数(是否打算定义变量?)

基础教程推荐