重写具有错误可见性的虚拟方法时如何收到警告

发布于 2024-12-07 09:52:03 字数 639 浏览 0 评论 0原文

当重写虚拟方法时，我注意到当我在可见性中犯了错误（受保护的方法被重写为公共方法）时，编译器不会警告我。

它是有效的 C++，但通常是一个错误。

例如：

#include <iostream>

class Base
{
protected:
  virtual void ProtectedMethod(void)
  {
    std::cout << "Base::ProtectedMethod" << std::endl;
  }
};

class Derived : public Base
{
public:
  virtual void ProtectedMethod(void)
  {
    std::cout << "Derived::ProtectedMethod" << std::endl;
  }
};

int main(int, char* [])
{
  Derived d;
  d.ProtectedMethod();
}

我尝试使用 gcc 和 clang 以及 -Wall -Wextra 进行编译，但没有成功。我对这段代码运行了 CppCheck，仍然没有成功。

什么工具可以帮助我检测到这一点？我需要修复我正在开发的库的整个源代码。

原文

When overriding a virtual method, I noticed that when I make a mistake in the visibility (protected method overridden as a public method), I'm not warned by the compiler.

It is valid C++, but usually it is a mistake.

For example:

#include <iostream>

class Base
{
protected:
  virtual void ProtectedMethod(void)
  {
    std::cout << "Base::ProtectedMethod" << std::endl;
  }
};

class Derived : public Base
{
public:
  virtual void ProtectedMethod(void)
  {
    std::cout << "Derived::ProtectedMethod" << std::endl;
  }
};

int main(int, char* [])
{
  Derived d;
  d.ProtectedMethod();
}

I tried compiling with gcc and clang, with -Wall -Wextra, with no luck.
I ran CppCheck on this code, still no luck.

What tool can help me detect this ?
I need to fix the whole sources of a library I'm working on.

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信愁 2024-12-14 09:52:04

Inspirel 允许您定义自己的规则：http://www.inspirel.com/vera/

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深海夜未眠 2024-12-14 09:52:04

我使用 ctags 找到了满足我需求的解决方案。

CTags 可以解析 C++ 并将信息转储到文件中。

使用以下选项：

$CTAGS -f $TAGFILE --fields=fkstia --c++-kinds=+p  -R $SOURCES

我可以以易于解析的格式获取所有需要的信息。

通过一些 grep 命令管道 $TAGFILE，我可以验证已知函数名称是否具有预期的可见性，否则会对受指控的文件发出警告。

以下是从 ctags 输出中提取信息的 bash 片段：

#!/bin/bash
function check_method {
    echo "Checking $1 (should be $2 and is not)"
    cat $TAGFILE | grep "^$1    " | grep "access" | grep -v "access:$2" | cut -f 2
    echo
}

# will warn anytime a method called ProtectedMethod is not protected
check_method ProtectedMethod protected

I found a solution to my needs using ctags.

CTags can parse C++ and dump information to a file.

Using the following options:

$CTAGS -f $TAGFILE --fields=fkstia --c++-kinds=+p  -R $SOURCES

I can get all the needed information in an easily parseable format.

Piping $TAGFILE through a few grep commands, I can verify that a known function name has the expected visibility, and issue a warning with the incriminated file otherwise.

Here is a bash snippet to extract info from the ctags output :

#!/bin/bash
function check_method {
    echo "Checking $1 (should be $2 and is not)"
    cat $TAGFILE | grep "^$1    " | grep "access" | grep -v "access:$2" | cut -f 2
    echo
}

# will warn anytime a method called ProtectedMethod is not protected
check_method ProtectedMethod protected

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