编译std :: vector的时间触发范围检查

问题描述

限时删除！！

目标：

我想要一个范围检查版本 std :: vector '运算符[] 用于我的调试版本，并且在发布模式下没有范围检查。

调试模式下的范围检查显然适用于调试，但它会导致我的发布代码减慢5％ - 10％，我想避免。

strong>可能的解决方案：

我在Stroustrup的C ++编程语言中找到了一个解决方案。他做了以下操作：

 模板< class T& 
 class checked_vector：public std :: vector< T> {
 public：
 using std :: vector< T> :: vector; 
 
 //用at（）覆盖operator [] 
}; 
  

这是有问题的，因为它继承一个非虚拟析构函数的类是危险的。 （和 。）

另一个想法是这样的类：

  template< class T> ; 
 class checked_vector {
 std :: vector< T>数据_; 
 
 public：
 //手动将所有公共方法的std :: vector放在这里
 
}; 
  

这样既繁琐，又创建了大量的复制粘贴， p>

上面两个解决方案的好处是我可以简单地在我的makefile中用宏定义来打开和关闭它们。

问题：

1. 有更好的解决方案吗？ （如果不是，为什么不？）


2. 如果不是，上述是否是可接受的？ （我知道这是一个基于意见的，如果可能的话，请集中在第一。）

解决方案

如果我没有误解，这是Visual Studio的通常情况。使用g ++，您必须使用 -D_GLIBCXX_CONCEPT_CHECKS -D_GLIBCXX_DEBUG -D_GLIBCXX_DEBUG_PEDANTIC 调用编译器。 （很可能你不需要所有三个，但我使用所有
三个系统。）与其他编译器，检查文​​档。这里的标准中未定义的行为的目的正是允许这种事情。

The goal:

I would like to have a range checked version of std::vector's operator [] for my debug builds and no range check in release mode.

The range check in debug mode is obviously good for debugging, but it causes a slowdown of 5% - 10% in my release code which I would like to avoid.

Possible solutions:

I found a solution in Stroustrup's "The C++ programming language". He did the following:

template <class T>
class checked_vector : public std::vector<T> {
    public:
        using std::vector<T>::vector;

        //override operator [] with at()
};

This is problematic because it inherits from a class with non-virtual destructor which is dangerous. (And the Lounge was not too fond of that solution.)

Another idea would be a class like this:

template <class T>
class checked_vector {
    std::vector<T> data_;

    public:
        //put all public methods of std::vector here by hand

};

This would be both tedious and create a large amount of copy-paste which is bad too.

The nice thing about both the above solutions is that I can simply toggle them on and off with a macro definition in my makefile.

The questions:

1. Is there a better solution? (If not, why not?)
2. If not, is one of the above considered acceptable? (I know this one is opinion based, please focus on No. 1 if possible.)

解决方案

If I'm not mistaken, this is the usual situation with Visual Studio. With g++, you have to invoke the compiler with -D_GLIBCXX_CONCEPT_CHECKS -D_GLIBCXX_DEBUG -D_GLIBCXX_DEBUG_PEDANTIC. (It's probable that you don't need all three, but I use allthree systematically.) With other compilers, check the documentation. The purpose of the undefined behavior in the standard here is precisely to allow this sort of thing.

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