size_t vs size_type and ptrdiff_t vs difference_type
size_type and difference_type are class member types which gives information about concrete type used in implementation, which may be or not be equal to size_t/prtdiff_t
Generally, types size_t and ptrdiff_t should be threated as size_type and difference_type for c-arrays and pointers respectively as those entities are not classes and cannot contain member types.
Use auto.
Generally, types size_t and ptrdiff_t should be threated as size_type and difference_type for c-arrays and pointers respectively as those entities are not classes and cannot contain member types.
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