cppdraft_translate/cppdraft/string/compare.md

[string.compare]

27 Strings library [strings]

27.4 String classes [string.classes]

27.4.3 Class template basic_string [basic.string]

27.4.3.8 String operations [string.ops]

27.4.3.8.4 basic_string​::​compare [string.compare]

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template<class T> constexpr int compare(const T& t) const noexcept(see below);

1

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Constraints:

• (1.1)

is_convertible_v<const T&, basic_string_view<charT, traits>> istrue and

• (1.2)

is_convertible_v<const T&, const charT*> isfalse.

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Effects: Equivalent to: return basic_string_view<charT, traits>(*this).compare(t);

3

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Remarks: The exception specification is equivalent tois_nothrow_convertible_v<const T&, basic_string_view<charT, traits>>.

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template<class T> constexpr int compare(size_type pos1, size_type n1, const T& t) const;

4

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Constraints:

• (4.1)

is_convertible_v<const T&, basic_string_view<charT, traits>> istrue and

• (4.2)

is_convertible_v<const T&, const charT*> isfalse.

5

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Effects: Equivalent to:return basic_string_view<charT, traits>(*this).substr(pos1, n1).compare(t);

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template<class T> constexpr int compare(size_type pos1, size_type n1, const T& t, size_type pos2, size_type n2 = npos) const;

6

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Constraints:

• (6.1)

is_convertible_v<const T&, basic_string_view<charT, traits>> istrue and

• (6.2)

is_convertible_v<const T&, const charT*> isfalse.

7

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Effects: Equivalent to:basic_string_view<charT, traits> s = *this, sv = t;return s.substr(pos1, n1).compare(sv.substr(pos2, n2));

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constexpr int compare(const basic_string& str) const noexcept;

8

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Effects: Equivalent to:return compare(basic_string_view<charT, traits>(str));

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

9

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Effects: Equivalent to:return compare(pos1, n1, basic_string_view<charT, traits>(str));

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constexpr int compare(size_type pos1, size_type n1, const basic_string& str, size_type pos2, size_type n2 = npos) const;

10

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Effects: Equivalent to:return compare(pos1, n1, basic_string_view<charT, traits>(str), pos2, n2);

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constexpr int compare(const charT* s) const;

11

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Effects: Equivalent to:return compare(basic_string_view<charT, traits>(s));

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

12

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Effects: Equivalent to: return compare(pos, n1, basic_string_view<charT, traits>(s));

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

13

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Effects: Equivalent to: return compare(pos, n1, basic_string_view<charT, traits>(s, n2));