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解析,这里唯一的区别是函数为const
.这是重载机制的一部分吗?解析一行的编译器算法是什么:
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();
在你给出的例子中:
vector<int>::const_iterator it = myvector.begin();
如果 myvector
不是 const,begin()
的非常量版本将被调用,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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