构造函数中的内存分配异常 [英] Memory Allocation Exception in Constructor

问题描述

我有一个构造函数，使用 new 运算符分配几个内存块。

 code> X :: X（）{
a = new int [100]; 
 b = new char [100]; 
 c = new float [100];我的问题是，如果分配 c <$ c 
 
 
  

$ b 失败，并且构造函数抛出异常， a 和 b 的内存将自动 和<$ c $

$

$

c> b 点不会被自动释放。每个 new [] 必须与 delete [] 明确平衡。

即使你的析构函数执行了删除（假设 a ， b 和 c 是类成员），那么你仍然会泄漏内存。

使用 std： ：vector s将会消除这些问题。

I have a constructor that allocates several blocks of memory using the new operator.

X::X() {
    a = new int[100];
    b = new char[100];
    c = new float[100];
}

My question is, if the allocation of c fails, and the constructor throws an exception, will the memory for a and b be automatically freed?

解决方案

The memory to which a and b point would not be automatically freed. Every new[] must be balanced explicitly with a delete[].

Even if your destructor performed the deletion (assuming a, b, and c are class members), then you'd still leak memory. That's because the destructor wouldn't be called in this case since the object failed to construct.

Using std::vectors would obviate these problems.

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