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Showing content from https://timsong-cpp.github.io/cppwp/n4659/string.view.ops below:

[string.view.ops]

24 Strings library [strings] 24.4 String view classes [string.view] 24.4.2 Class template basic_string_view [string.view.template] 24.4.2.6 String operations [string.view.ops]

size_type copy(charT* s, size_type n, size_type pos = 0) const;

Let rlen be the smaller of n and size() - pos.

Throws: out_of_range if pos > size().

Requires: [s, s + rlen) is a valid range.

Effects: Equivalent to traits::copy(s, data() + pos, rlen).

constexpr basic_string_view substr(size_type pos = 0, size_type n = npos) const;

Let rlen be the smaller of n and size() - pos.

Throws: out_of_range if pos > size().

Effects: Determines rlen, the effective length of the string to reference.

Returns: basic_string_view(data() + pos, rlen).

constexpr int compare(basic_string_view str) const noexcept;

Let rlen be the smaller of size() and str.size().

Effects: Determines rlen, the effective length of the strings to compare. The function then compares the two strings by calling traits::compare(data(), str.data(), rlen).

Returns: The nonzero result if the result of the comparison is nonzero. Otherwise, returns a value as indicated in Table 66.

Table

—

compare()

results

Condition Return Value size() < str.size() < 0 size() == str.size() 0 size() > str.size() > 0

constexpr int compare(size_type pos1, size_type n1, basic_string_view str) const;

Effects: Equivalent to: return substr(pos1, n1).compare(str);

constexpr int compare(size_type pos1, size_type n1, basic_string_view str, size_type pos2, size_type n2) const;

Effects: Equivalent to: return substr(pos1, n1).compare(str.substr(pos2, n2));

constexpr int compare(const charT* s) const;

Effects: Equivalent to: return compare(basic_string_view(s));

constexpr int compare(size_type pos1, size_type n1, const charT* s) const;

Effects: Equivalent to: return substr(pos1, n1).compare(basic_string_view(s));

constexpr int compare(size_type pos1, size_type n1, const charT* s, size_type n2) const;

Effects: Equivalent to: return substr(pos1, n1).compare(basic_string_view(s, n2));

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