什么是i ++或++ i效率更高? [英] What is more efficient, i++ or ++i?

问题描述

完全重复: i ++和++ i在C ++中是否存在性能差异?
完全重复: i ++和++ i循环之间的区别?

Exact Duplicate: Is there a performance difference between i++ and ++i in C++?
Exact Duplicate: Difference between i++ and ++i in a loop?

使用i ++或++ i效率更高?

What is more efficient, i++ or ++i?

我只在Java和C/C ++中使用过此语言，但我实际上是要求使用此语言实现的所有语言.

I have only used this in Java and C/C++, but I am really asking for all languages that this is implemented in.

在大学里，我有一位教授向我们展示了++ i效率更高，但这已经有几年了，我想从Stack Overflow社区中获取意见.

In college I had a professor show us that ++i was more efficient, but it has been a couple of years, and I would like to get input from the Stack Overflow community.

推荐答案

i ++:

• 创建i的临时副本
• 增加我
• 返回临时副本

++ i:

• 增加我
• 返回我

启用优化后，最终的程序集很可能是相同的，但是++ i效率更高.

With optimizations on, it is quite possible that the resulting assembly is identical, however ++i is more efficient.

edit:请记住，在C ++中，我可能是支持前缀和后缀++运算符的任何对象.对于复杂的对象，临时复制成本不可忽略.

edit : keep in mind that in C++, i may be whatever object that support the prefix and postfix ++ operator. For complex objects, the temporary copy cost is non negligible.

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