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

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< cpp‎ | string‎ | basic string
 
 
 
std::basic_string
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basic_string::replace_with_range
(C++23)
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template< container-compatible-range<CharT> R >

constexpr std::basic_string& replace_with_range( const_iterator first,
                                                 const_iterator last,

                                                 R&& rg );
(since C++23)

Replaces the characters in the range [firstlast) with the characters from the range rg.

Equivalent to

return replace(first,
               last,
               std::basic_string(
                   std::from_range,
                   std::forward<R>(rg),
                   get_allocator())
);

Contents

[edit] Parameters

first, last - range of characters that is going to be replaced
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 <algorithm>
#include <cassert>
#include <forward_list>
#include <iterator>
#include <string>
 
int main()
{
    using namespace std::literals;
 
    auto s{"Today is today!"s};
    constexpr auto today{"today"sv};
    constexpr auto tomorrow{"tomorrow's yesterday"sv};
    std::forward_list<char> rg;
    std::ranges::reverse_copy(tomorrow, std::front_inserter(rg));
 
    const auto pos{s.rfind(today)};
    assert(pos != s.npos);
    const auto first{std::next(s.begin(), pos)};
    const auto last{std::next(first, today.length())};
 
#ifdef __cpp_lib_containers_ranges
    s.replace_range(first, last, rg);
#else
    s.replace(first, last, rg.cbegin(), rg.cend());
#endif
 
    assert("Today is tomorrow's yesterday!" == s);
}

[edit] See also

replaces specified portion of a string
(public member function) [edit]