C*******l
发帖数: 105 | 1 C＋＋中有些code把函数返回值定义成const，这样做的好处是什么？我的理解是函数返
回值已经是rvalue了，已经不能改变了，但为什么还要在函数定义时写上const，这是
不是多此一举？ | k**f
发帖数: 372 | 2
Usually const is used along with pointer or reference in the return type.
The returned value can only be assigned to a const pointer or bonded to a
const reference. If the underlying type is a class (struct), only the const
method can be called using such const pointers and references.
Otherwise, if you return a non-const pointer or reference, you can change
the object through the pointer or reference.
【在 C*******l 的大作中提到】
: C＋＋中有些code把函数返回值定义成const，这样做的好处是什么？我的理解是函数返
: 回值已经是rvalue了，已经不能改变了，但为什么还要在函数定义时写上const，这是
: 不是多此一举？
| C*******l
发帖数: 105 | 3 right, thanks
const
【在 k**f 的大作中提到】
:
: Usually const is used along with pointer or reference in the return type.
: The returned value can only be assigned to a const pointer or bonded to a
: const reference. If the underlying type is a class (struct), only the const
: method can be called using such const pointers and references.
: Otherwise, if you return a non-const pointer or reference, you can change
: the object through the pointer or reference.
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