456-C++函数重载机制（汇编层面分析）

1、什么是函数重载（what）？

• 在同一作用域内，可以有一组相同函数名，不同参数列表的函数，这组函数被称为函数重载。
• 重载函数通常用来命名一组功能相似的函数，这样做减少了函数名的数量，避免了命名空间的污染，对于程序的可读性有很大的好处。

When two or more different declarations are specified for a single name in the same scope, that name is said to overloaded. By extension, two declarations in the same scope that declare the same name but with different types are called overloaded declarations. Only function declarations can be overloaded; object and type declarations cannot be overloaded.
——摘自《ANSI C++ Standard. P290》

举例： overload.cc

#include<iostream>
using 
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