自定义类对象实例化提示未声明标识符，Cube构建代码调试求助

Hey there! We’ve all been guilty of writing a big chunk of code before hitting "run"—no judgment here, let’s work through this first error together.

First, let’s recap your setup to make sure I’m aligned:

• You’re building a program that constructs cubes from rectangles, which are built from lines, which start with points
• You held off running anything until your code was complete, and now you’re facing your first bug
• You’re using Visual Studio, and you’re not sure if the issue is specific to VS or a general C++ problem
• You haven’t had a chance to test your code on Fedora yet
• You shared a truncated snippet of your Point_class.h file

Your Truncated Point_class.h Snippet #

#pragma once
#ifndef POINT_H
#define POINT_H

class PointType {
private:
    int...

Initial Troubleshooting Tips #

Since your code cuts off at the int... part, let’s start with the most common pitfalls for a basic Point class in C++—especially ones that might trip up Visual Studio:

• Incomplete member variables: That int... looks like you didn’t finish defining your private fields (probably x/y coordinates, right?). Make sure each member has a valid name, like int x; int y;
• Syntax typos: Header files are super picky about closing braces and semicolons. Double-check that your PointType class has a closing } and that the class declaration ends with a semicolon (;—easy to forget!)
• VS-specific header behavior: While using both #pragma once and include guards is fine, Visual Studio can sometimes have oddities with header ordering or preprocessor directives. Double-check that your guards are correctly formatted (your snippet looks okay here, but it’s worth verifying)
• Unresolved dependencies: If other classes (like your Line or Rectangle classes) depend on PointType, make sure you’re including Point_class.h correctly in those files, and that you’re not creating circular includes (e.g., Point includes Line and Line includes Point)

Next Steps to Pinpoint the Issue #

• Share the full Point_class.h code: The truncated snippet makes it hard to spot syntax errors. Post the complete class definition, including any constructors, destructors, or member functions you’ve written
• Run a minimal test: Create a tiny test program that only includes Point_class.h and tries to make a PointType object. This will tell you if the error is in the Point class itself, or if it’s coming from interactions with other parts of your code
• Test on Fedora (if you can): Compiling with g++ on Fedora will help you rule out if this is a Visual Studio-specific problem (like a project setting or compiler extension quirk)

内容的提问来源于stack exchange，提问作者Spider Jerusalem