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Showing content from https://timsong-cpp.github.io/cppwp/n4140/string::compare below:

[string::compare]

int compare(const basic_string& str) const noexcept;

Effects: Determines the effective length rlen of the strings to compare as the smallest of size() and str.size(). 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 [tab:strings.compare].

Table

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results

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

Returns: basic_string(*this,pos1,n1).compare(str).

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

Returns: basic_string(*this, pos1, n1).compare(basic_string(str, pos2, n2)).

int compare(const charT* s) const;

Returns: compare(basic_string(s)).

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

Returns: basic_string(*this, pos, n1).compare(basic_string(s)).

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

Returns: basic_string(*this, pos, n1).compare(basic_string(s, n2)).

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