来个传道授业的- -
by lookluke @ 2019-12-13 18:28:53
@[lookluke](/user/298680) 有冲突，cctype中有tolower函数，将单个字符转小写
by panyf @ 2019-12-13 18:35:34
~~transform是什么函数~~
by Curators @ 2019-12-13 19:04:32
```
template<class _IIter, class _OIter, class _UnaryOperation> _OIter std::transform(_IIter __first, _IIter __last, _OIter __result, _UnaryOperation __unary_op)
+1 overload
@[brief](/user/285695) Perform an operation on a sequence.
@ingroup mutating_algorithms
@param __first An input iterator.
@param __last An input iterator.
@param __result An output iterator.
@param __unary_op A unary operator.
@return An output iterator equal to @p __result+(__last-__first).
Applies the operator to each element in the input range and assigns
the results to successive elements of the output sequence.
Evaluates @p *(__result+N)=unary_op(*(__first+N)) for each @c N in the
range @p [0,__last-__first).
@p unary_op must not alter its argument.
```
by Cloudflare @ 2019-12-13 19:29:52