const charT* c_str() const noexcept; const charT* data() const noexcept;
Returns: A pointer p such that p + i == &operator[](i) for each i in [0,size()].
Complexity: Constant time.
Requires: The program shall not alter any of the values stored in the character array.
allocator_type get_allocator() const noexcept;
Returns: A copy of the Allocator object used to construct the string or, if that allocator has been replaced, a copy of the most recent replacement.
21.4.7.2 basic_string::find [string::find] size_type find(const basic_string& str, size_type pos = 0) const noexcept;
Effects: Determines the lowest position xpos, if possible, such that both of the following conditions obtain:
pos <= xpos and xpos + str.size() <= size();
traits::eq(at(xpos+I), str.at(I)) for all elements I of the string controlled by str.
Returns: xpos if the function can determine such a value for xpos. Otherwise, returns npos.
Remarks: Uses traits::eq().
size_type find(const charT* s, size_type pos, size_type n) const;
Returns: find(basic_string(s,n),pos).
size_type find(const charT* s, size_type pos = 0) const;
Requires: s points to an array of at least traits::length(s) + 1 elements of charT.
Returns: find(basic_string(s), pos).
size_type find(charT c, size_type pos = 0) const;
Returns: find(basic_string(1,c), pos).
21.4.7.3 basic_string::rfind [string::rfind] size_type rfind(const basic_string& str, size_type pos = npos) const noexcept;
Effects: Determines the highest position xpos, if possible, such that both of the following conditions obtain:
xpos <= pos and xpos + str.size() <= size();
traits::eq(at(xpos+I), str.at(I)) for all elements I of the string controlled by str.
Returns: xpos if the function can determine such a value for xpos. Otherwise, returns npos.
Remarks: Uses traits::eq().
size_type rfind(const charT* s, size_type pos, size_type n) const;
Returns: rfind(basic_string(s, n), pos).
size_type rfind(const charT* s, size_type pos = npos) const;
Requires: s points to an array of at least traits::length(s) + 1 elements of charT.
Returns: rfind(basic_string(s), pos).
size_type rfind(charT c, size_type pos = npos) const;
Returns: rfind(basic_string(1,c),pos).
21.4.7.4 basic_string::find_first_of [string::find.first.of] size_type find_first_of(const basic_string& str, size_type pos = 0) const noexcept;
Effects: Determines the lowest position xpos, if possible, such that both of the following conditions obtain:
pos <= xpos and xpos < size();
traits::eq(at(xpos), str.at(I)) for some element I of the string controlled by str.
Returns: xpos if the function can determine such a value for xpos. Otherwise, returns npos.
Remarks: Uses traits::eq().
size_type find_first_of(const charT* s, size_type pos, size_type n) const;
Returns: find_first_of(basic_string(s, n), pos).
size_type find_first_of(const charT* s, size_type pos = 0) const;
Requires: s points to an array of at least traits::length(s) + 1 elements of charT.
Returns: find_first_of(basic_string(s), pos).
size_type find_first_of(charT c, size_type pos = 0) const;
Returns: find_first_of(basic_string(1,c), pos).
21.4.7.5 basic_string::find_last_of [string::find.last.of] size_type find_last_of(const basic_string& str, size_type pos = npos) const noexcept;
Effects: Determines the highest position xpos, if possible, such that both of the following conditions obtain:
xpos <= pos and xpos < size();
traits::eq(at(xpos), str.at(I)) for some element I of the string controlled by str.
Returns: xpos if the function can determine such a value for xpos. Otherwise, returns npos.
Remarks: Uses traits::eq().
size_type find_last_of(const charT* s, size_type pos, size_type n) const;
Returns: find_last_of(basic_string(s, n), pos).
size_type find_last_of(const charT* s, size_type pos = npos) const;
Requires: s points to an array of at least traits::length(s) + 1 elements of charT.
Returns: find_last_of(basic_string(s), pos).
size_type find_last_of(charT c, size_type pos = npos) const;
Returns: find_last_of(basic_string(1,c),pos).
21.4.7.6 basic_string::find_first_not_of [string::find.first.not.of] size_type find_first_not_of(const basic_string& str, size_type pos = 0) const noexcept;
Effects: Determines the lowest position xpos, if possible, such that both of the following conditions obtain:
pos <= xpos and xpos < size();
traits::eq(at(xpos), str.at(I)) for no element I of the string controlled by str.
Returns: xpos if the function can determine such a value for xpos. Otherwise, returns npos.
Remarks: Uses traits::eq().
size_type find_first_not_of(const charT* s, size_type pos, size_type n) const;
Returns: find_first_not_of(basic_string(s, n), pos).
size_type find_first_not_of(const charT* s, size_type pos = 0) const;
Requires: s points to an array of at least traits::length(s) + 1 elements of charT.
Returns: find_first_not_of(basic_string(s), pos).
size_type find_first_not_of(charT c, size_type pos = 0) const;
Returns: find_first_not_of(basic_string(1, c), pos).
21.4.7.7 basic_string::find_last_not_of [string::find.last.not.of] size_type find_last_not_of(const basic_string& str, size_type pos = npos) const noexcept;
Effects: Determines the highest position xpos, if possible, such that both of the following conditions obtain:
xpos <= pos and xpos < size();
traits::eq(at(xpos), str.at(I)) for no element I of the string controlled by str.
Returns: xpos if the function can determine such a value for xpos. Otherwise, returns npos.
Remarks: Uses traits::eq().
size_type find_last_not_of(const charT* s, size_type pos, size_type n) const;
Returns: find_last_not_of(basic_string(s, n), pos).
size_type find_last_not_of(const charT* s, size_type pos = npos) const;
Requires: s points to an array of at least traits::length(s) + 1 elements of charT.
Returns: find_last_not_of(basic_string(s), pos).
size_type find_last_not_of(charT c, size_type pos = npos) const;
Returns: find_last_not_of(basic_string(1, c), pos).
21.4.7.8 basic_string::substr [string::substr] basic_string substr(size_type pos = 0, size_type n = npos) const;
Throws: out_of_range if pos > size().
Effects: Determines the effective length rlen of the string to copy as the smaller of n and size() - pos.
Returns: basic_string(data()+pos,rlen).
21.4.7.9 basic_string::compare [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
72—
compare()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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