1
The two classes do basically the same, have a pointer to the first element of the array and the size of the array. I know that string_view is used for character arrays, but could not be used span for the same? I would like to know:
2
To the std::basic_string_view, there is a whole set of specific methods to handle strings. std::span is for generic types, including user-defined types.
cppreference for std::basic_string_view:
The class template basic_string_view describes an Object that can refer to Constant contiguous Quence of char-like Objects.
cppreference for std::span:
The class template span describes an Object that can refer to a contiguous Quence of Objects
std::span describes a sequence of objects without citing any in particular. It is a class decorated with a template that receives a type T that will be the type of the object used to create the sequence.
When you "specialize" std::span creating a class by part std::basic_string_view you open up scope to make operations more efficient once the type is known, and implement methods relevant to the specific type.
Obs.: std::basic_string_view is also decorated with a template, but is for the types char, wchar_t, char8_t, char16_t and char32_t.
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Additionally,
std::basic_string_viewoffers operations such assubstr,starts_with,ends_with,findetc, which are common operations with strings.– Mário Feroldi