How does overloading of const and non-const functions work?(const 和非常量函数的重载是如何工作的?)
问题描述
STL
充满了这样的定义:
iterator begin ();
const_iterator begin () const;
由于返回值不参与重载决议,这里唯一的区别是函数是const
.这是重载机制的一部分吗?编译器的解析算法是什么:
As return value does not participate in overloading resolution, the only difference here is the function being const
. Is this part of the overloading mechanism? What is the compiler's algorithm for resolving a line like:
vector<int>::const_iterator it = myvector.begin();
推荐答案
在你给出的例子中:
vector<int>::const_iterator it = myvector.begin();
如果 myvector
不是 const,则将调用 begin()
的非 const 版本,您将依赖从迭代器到 const_iterator 的隐式转换.
if myvector
isn't const the non-const version of begin()
will be called and you will be relying on an implicit conversion from iterator to const_iterator.
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