std::basic_string::insert(3) C++ Standard Libary std::basic_string::insert(3) NAME std::basic_string::insert - std::basic_string::insert Synopsis basic_string& insert( (constexpr size_type index, size_type (1) since count, CharT ch ); C++20) basic_string& insert( (constexpr size_type index, const (2) since CharT* s ); C++20) basic_string& insert( (constexpr size_type index, const (3) since CharT* s, size_type count ); C++20) basic_string& insert( (constexpr size_type index, const (4) since basic_string& str ); C++20) basic_string& insert( size_type index, const basic_string& str, (until C++14) size_type s_index, size_type count ); basic_string& insert( (since size_type index, const C++14) basic_string& str, (constexpr since size_type s_index, size_type C++20) count = npos ); iterator insert( iterator (until pos, CharT ch ); C++11) (since iterator insert( C++11) const_iterator pos, CharT ch (constexpr ); since C++20) void insert( iterator pos, (until size_type count, CharT ch ); C++11) (since iterator insert( C++11) const_iterator pos, (cons- texpr size_type count, CharT ch ); since C++20) template< class InputIt > void insert( iterator pos, (5) (until InputIt first, InputIt last C++11) ); template< class InputIt > (since iterator insert( C++11) const_iterator pos, InputIt (constexpr first, InputIt last ); (6) since C++20) iterator insert( (since const_iterator pos, (7) C++11) std::initializer_list<CharT> (9) (constexpr ilist ); since C++20) template< class (8) (since StringViewLike > C++17) basic_string& insert( (10) (constexpr size_type index, const since StringViewLike& t ); C++20) template< class StringViewLike > (since basic_string& insert( C++17) size_type index, const (11) (constexpr StringViewLike& t, since C++20) size_type t_index, size_type count = npos ); Inserts characters into the string. 1) Inserts count copies of character ch at the position index. 2) Inserts null-terminated character string pointed to by s at the posi- tion index. The length of the string is determined by the first null character using Traits::length(s). 3) Inserts the characters in the range [s, s + count) at the position index. The range can contain null characters. 4) Inserts string str at the position index. 5) Inserts a string, obtained by str.substr(s_index, count) at the posi- tion index. 6) Inserts character ch before the character pointed by pos. 7) Inserts count copies of character ch before the element (if any) pointed by pos. 8) Inserts characters from the range [first, last) before the element (if any) pointed by pos, as if by insert(pos - begin(), basic_string(first, last, get_allocator())). This overload does not participate in overload resolution if InputIt (since C++11) does not satisfy LegacyInputIterator. 9) Inserts elements from initializer list ilist before the element (if any) pointed by pos. 10) Implicitly converts t to a string view sv as if by std::ba- sic_string_view<CharT, Traits> sv = t;, then inserts the elements from sv before the element (if any) pointed by index, as if by insert(index, sv.data(), sv.size()). This overload participates in overload resolution only if std::is_convertible_v<const StringViewLike&, std::basic_string_view<CharT, Traits>> is true and std::is_convertible_v<const StringViewLike&, const CharT*> is false. 11) Implicitly converts t to a string view sv as if by std::ba- sic_string_view<CharT, Traits> sv = t;, then inserts, before the element (if any) pointed by index, the characters from the subview [t_index, t_index + count) of sv. * If the requested subview lasts past the end of sv, or if count == npos, the resulting subview is [t_index, sv.size()). * If t_index > sv.size(), or if index > size(), std::out_of_range is thrown. This overload participates in overload resolution only if std::is_convertible_v<const StringViewLike&, std::basic_string_view<CharT, Traits>> is true and std::is_convertible_v<const StringViewLike&, const CharT*> is false. If pos is not a valid iterator on *this, the behavior is undefined. Parameters index - position at which the content will be inserted pos - iterator before which the characters will be inserted ch - character to insert count - number of characters to insert s - pointer to the character string to insert str - string to insert first, last - range defining characters to insert s_index - position of the first character in str to insert ilist - std::initializer_list to insert the characters from t - object (convertible to std::basic_string_view) to insert the characters from t_index - position of the first character in t to insert Type requirements - InputIt must meet the requirements of LegacyInputIterator. Return value 1-5) *this 6-9) An iterator which refers to the copy of the first inserted charac- ter or pos if no characters were inserted (count == 0 or first == last or ilist.size() == 0) 10,11) *this Exceptions 1-4,10) Throws std::out_of_range if index > size(). 5) Throws std::out_of_range if index > size() or if s_index > str.size(). 11) Throws std::out_of_range if index > size() or if t_index > sv.size(). In all cases, throws std::length_error if size() + ins_count > max_size() where ins_count is the number of characters that will be inserted. In all cases, if std::allocator_traits<Allocator>::allocate throws an (since C++20) exception, it is rethrown. If an exception is thrown for any reason, this function has no effect (strong exception safety guarantee). Example // Run this code #include <cassert> #include <iterator> #include <string> using namespace std::string_literals; int main() { std::string s = "xmplr"; // insert(size_type index, size_type count, char ch) s.insert(0, 1, 'E'); assert("Exmplr" == s); // insert(size_type index, const char* s) s.insert(2, "e"); assert("Exemplr" == s); // insert(size_type index, string const& str) s.insert(6, "a"s); assert("Exemplar" == s); // insert(size_type index, string const& str, // size_type s_index, size_type count) s.insert(8, " is an example string."s, 0, 14); assert("Exemplar is an example" == s); // insert(const_iterator pos, char ch) s.insert(s.cbegin() + s.find_first_of('n') + 1, ':'); assert("Exemplar is an: example" == s); // insert(const_iterator pos, size_type count, char ch) s.insert(s.cbegin() + s.find_first_of(':') + 1, 2, '='); assert("Exemplar is an:== example" == s); // insert(const_iterator pos, InputIt first, InputIt last) { std::string seq = " string"; s.insert(s.begin() + s.find_last_of('e') + 1, std::begin(seq), std::end(seq)); assert("Exemplar is an:== example string" == s); } // insert(const_iterator pos, std::initializer_list<char>) s.insert(s.cbegin() + s.find_first_of('g') + 1, {'.'}); assert("Exemplar is an:== example string." == s); } Defect reports The following behavior-changing defect reports were applied retroac- tively to previously published C++ standards. DR Applied to Behavior as published Correct behavior LWG 7 C++98 overload (8) referred to a non-existing refers to overload (4) overload correctly LWG 847 C++98 there was no exception safety guarantee added strong exception safety guarantee LWG 2946 C++17 overload (10) caused ambiguity in some avoided by making it a cases template See also insert_range inserts a range of characters (C++23) (public member function) append appends characters to the end (public member function) push_back appends a character to the end (public member function) http://cppreference.com 2024.06.10 std::basic_string::insert(3)
NAME | Synopsis | Parameters | Type requirements | Return value | Exceptions | Example | See also
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