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

From cppreference.com
< cpp‎ | string‎ | basic string
 
 
 
std::basic_string
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basic_string::assign_range
(C++23)
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template< container-compatible-range<CharT> R >
constexpr std::basic_string& assign_range( R&& rg );
(since C++23)

Replaces the contents of the string with the values in the range rg.

Equivalent to

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

Contents

[edit] Parameters

rg - a container compatible range

[edit] Return value

*this

[edit] Complexity

Linear in size of rg.

[edit] 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).

[edit] Notes

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

[edit] Example

#include <cassert>
#include <string>
 
int main()
{
    const auto source = {'s', 'o', 'u', 'r', 'c', 'e'};
    std::string destination{"destination"};
 
#ifdef __cpp_lib_containers_ranges
    destination.assign_range(source);
#else
    destination.assign(source.begin(), source.end());
#endif
 
    assert(destination == "source");
}

[edit] See also

assign characters to a string
(public member function) [edit]
assigns values to the string
(public member function) [edit]
constructs a basic_string
(public member function) [edit]