使 std::map key const 有意义吗?
在定义 std::map
时,将键类型设为 const
是否有意义?
When defining a std::map
, does it make sense to make the key type const
?
推荐答案
实际上key已经是const
了,因为一旦元素被插入到map中,key就不能改变了.
The key is already const
, actually, because a key cannot change once an element was inserted in the map.
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