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Difference between revisions of "cpp/string/basic string/append range"

From cppreference.com
< cpp‎ | string‎ | basic string
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===Parameters===
 
===Parameters===
 
{{par begin}}
 
{{par begin}}
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{{par|rg|a {{ls|cpp/ranges/to|container compatible range}}}}
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{{par|rg|a {{ls|cpp/ranges/tocontainer compatible range}}}}
 
{{par end}}
 
{{par end}}
  
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===Exceptions===
 
===Exceptions===
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Throws {{lc|std::length_error}} if the resultant string size would exceed {{rlpf|max_size}}.
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{{string}}
  
 
{{cpp/strong exception safety guarantee}}
 
{{cpp/strong exception safety guarantee}}
  
 
===Notes===
 
===Notes===
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{{feature test macro|__cpp_lib_containers_ranges|value=202202L|std=C++23|member functions that accept {{ls|cpp/ranges/to|container compatible range}}}}
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{{feature test macro|__cpp_lib_containers_ranges|value=202202L|std=C++23|member functions that accept {{ls|cpp/ranges/tocontainer compatible range}}}}
  
 
===Example===
 
===Example===
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{{example}}
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{{example
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===See also===
 
===See also===

Latest revision as of 15:47, 28 October 2023

 
C++
 
Strings library
 
std::basic_string
 
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()));

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 cause size() to exceed 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

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");
}

[edit] See also

 appends characters to the end
(public member function) [edit]
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