为什么C ++编译器不能将每个整数声明初始化为0,无论是局部还是全局或成员? [英] Why do C++ compilers not initialise every integer declaration to 0, be it local or global or a member?
问题描述
这让我很奇怪为什么C ++编译器不会将每个整数声明初始化为0,无论是局部还是全局或成员?为什么未初始化的部分存在于内存模型中?
It baffles me why C++ compilers do not initialise every integer declaration to 0, be it local or global or members? Why do uninitialised sections exists in the memory model?
推荐答案
我知道这是一个愚蠢的答案,
I know it's a dull answer, but your question begs for it exactly:
因为C ++标准如此。
Because the C++ standard says so.
为什么这样说?因为C ++建立在一个原则上:
Why does it say so? Because C++ is built on a principle:
不支付你不使用的东西。
Don't pay for what you don't use.
将内存设置为某个值会耗费CPU时间和内存带宽。如果你想做,明确做它。变量声明不应产生此成本。
Setting memory to a certain value costs CPU time and memory bandwidth. If you want to do it, do it explicitly. A variable declaration should not incur this cost.
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