std::basic_string<CharT,Traits,Allocator>:: append_range

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template < container-compatible-range < CharT > R >
constexpr std:: basic_string & append_range ( R && rg ) ;
(since C++23)

Appends all characters from the range rg .

Equivalent to 

return append(std::basic_string( std::from_range, std​::​forward<R>(rg), get_allocator()));

Parameters

rg - a container compatible range

Return value

* this

Complexity

Linear in size of rg .

Exceptions

If the operation would result in size ( ) > max_size ( ) , throws std::length_error .

If an exception is thrown for any reason, this function has no effect ( strong exception safety guarantee ).

Notes

Feature-test macro Value Std Feature
__cpp_lib_containers_ranges 202202L (C++23) member functions that accept container compatible range

Example

Run this code 
#include <cassert>
#include <string>
 
int main()
{
    std::string head{"long long"};
    const auto tail = {' ', 'i', 'n', 't'};
 
#ifdef __cpp_lib_containers_ranges
    head.append_range(tail);
#else
    head.append(tail.begin(), tail.end());
#endif
 
    assert(head == "long long int");
}

See also

appends characters to the end
(public member function)
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