v3.1.0
remove_cvref
<functional>
deduction guides
set::contains
shared_ptr
弃用mt19937
begin end
支持C样式数组
span
vector::cbegin cend
remove_cvref
<functional>
deduction guides
set::contains
shared_ptr
弃用mt19937
begin end
支持C样式数组
span
vector::cbegin cend