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    From cppreference.com
    synopsis to test 
    basic_string& replace( size_type pos, size_type count,
                       const basic_string& str );
    		(1) (until C++20) 
    constexpr basic_string& replace( size_type pos, size_type count,
                                 const basic_string& str );
    		(constexpr since c++20) 
    basic_string& replace( const_iterator first, const_iterator last,
                       const basic_string& str );
    		(2) (until C++20) 
    constexpr basic_string& replace( const_iterator first, const_iterator last,
                                 const basic_string& str );
    		(constexpr since c++20) 
    basic_string& replace( size_type pos, size_type count,
                       const basic_string& str,
                       size_type pos2, size_type count2 );
    		(3) (until C++14) 
    basic_string& replace( size_type pos, size_type count,
                       const basic_string& str,
                       size_type pos2, size_type count2 = npos );
    		(since C++14)
    (until C++20)    		 
    constexpr basic_string& replace( size_type pos, size_type count,
                                 const basic_string& str,
                                 size_type pos2, size_type count2 = npos );
    		(since C++14)(constexpr since c++20) 
    template< class InputIt >
basic_string& replace( const_iterator first, const_iterator last,
                       InputIt first2, InputIt last2 );
    		(4) (until C++20) 
    template< class InputIt >
constexpr basic_string& replace( const_iterator first, const_iterator last,
                                 InputIt first2, InputIt last2 );
    		(constexpr since c++20) 
    basic_string& replace( size_type pos, size_type count,
                       const CharT* cstr, size_type count2 );
    		(5) (until C++20) 
    constexpr basic_string& replace( size_type pos, size_type count,
                                 const CharT* cstr, size_type count2 );
    		(constexpr since c++20) 
    basic_string& replace( const_iterator first, const_iterator last,
                       const CharT* cstr, size_type count2 );
    		(6) (until C++20) 
    constexpr basic_string& replace( const_iterator first, const_iterator last,
                                 const CharT* cstr, size_type count2 );
    		(constexpr since c++20) 
    basic_string& replace( size_type pos, size_type count,
                       const CharT* cstr );
    		(7) (until C++20) 
    constexpr basic_string& replace( size_type pos, size_type count,
                                 const CharT* cstr );
    		(constexpr since c++20) 
    basic_string& replace( const_iterator first, const_iterator last,
                       const CharT* cstr );
    		(8) (until C++20) 
    constexpr basic_string& replace( const_iterator first, const_iterator last,
                                 const CharT* cstr );
    		(constexpr since c++20) 
    basic_string& replace( size_type pos, size_type count,
                       size_type count2, CharT ch );
    		(9) (until C++20) 
    constexpr basic_string& replace( size_type pos, size_type count,
                                 size_type count2, CharT ch );
    		(constexpr since c++20) 
    basic_string& replace( const_iterator first, const_iterator last,
                       size_type count2, CharT ch );
    		(10) (until C++20) 
    constexpr basic_string& replace( const_iterator first, const_iterator last,
                                 size_type count2, CharT ch );
    		(constexpr since c++20) 
    basic_string& replace( const_iterator first, const_iterator last, 
                       std::initializer_list<CharT> ilist );
    		(11) (until C++20) 
    constexpr basic_string& replace( const_iterator first, const_iterator last, 
                                 std::initializer_list<CharT> ilist );
    		(constexpr since c++20) 
    template < class T >
basic_string& replace( size_type pos, size_type count,
                       const T& t );
    		(12) (until C++20) 
    template < class T >
constexpr basic_string& replace( size_type pos, size_type count,
                                 const T& t );
    		(constexpr since c++20) 
    template < class T >
basic_string& replace( const_iterator first, const_iterator last,
                       const T& t );
    		(13) (until C++20) 
    template < class T >
constexpr basic_string& replace( const_iterator first, const_iterator last,
                                 const T& t );
    		(constexpr since c++20) 
    template < class T >
basic_string& replace( size_type pos, size_type count, const T& t,
                       size_type pos2, size_type count2 = npos );
    		(14) (until C++20) 
    template < class T >
constexpr basic_string& replace( size_type pos, size_type count, const T& t,
                                 size_type pos2, size_type count2 = npos );
    		(constexpr since c++20)
    1. First
    2. Second
    3. Third
    4. Fourth
    5. Fifth
      • Fifth-1 [..c++20) (until C++20)
        • Fifth-1-a
        • Fifth-1-b [c++11..) (since C++11)
      • Fifth-2 [c++11..c++20) (since C++11)(until C++20)
        • Fifth-2-a
        • Fifth-2-a
      • Fifth-3 [..c++20) (until C++20)
        • Fifth-3-a
        • Fifth-3-a
      • Fifth-4
        • Fifth-4-a
        • Fifth-4-b [..c++20) (until C++20)
        • Fifth-4-b [c++14..c++20) (since C++14)(until C++20)

    The potential scope of a name declared

    • in the init-statement of a [[../for|for loop]],
    • in the condition of a [[../for|for loop]],
    • in the range_declaration of a [[../range-for|range-for loop]],
    • in the init-statement of a [[../if|if statement]] or [[../switch|switch statement]],(since C++17)
    • in the condition of a [[../if|if statement]], [[../switch|switch statement]], or [[../while|while loop]]

    begins at the point of declaration and ends at the end of the controlled statement.


    Deduction guides

    		 (since C++17)

    Deduction guides

    		 (since C++17)

    (a slightly optimized variation.)