Daily bit(e) of C++ | std::string_view

Daily bit(e) of C++ #257, The borrowed range for strings: std::string_view.

The std::string_view is a borrowed range that can reference any (not necessarily null-terminated) string, i.e. string literals, std::string and other character contiguous ranges.

std::string_view should be preferred over an immutable std::string, except for cases when ownership is also required, as std::string_view can only reference data owned by other ranges.

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