cppreference std string substr - PrivacyWall

https://en.cppreference.com/w/cpp/string/basic_string/substr

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std::basic_string<CharT,Traits,Allocator>:: substr - Reference

Returns a substring [pos,pos + count). If the requested substring extends past the end of the string, i.e. the count is greater than size()- pos (e.g. if count == npos), the returned substring is [pos,size ()). 1) Equivalent to return basic_string(*this, pos, count);. 2) Equivalent to return basic_string(std::move(*this), pos, count);.

https://cplusplus.com/reference/string/string/substr/

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Returns a newly constructed string object with its value initialized to a copy of a substring of this object. The substring is the portion of the object that starts at character position pos and spans len characters (or until the end of the string, whichever comes first). Position of the first character to be copied as a substring.

http://naipc.uchicago.edu/2014/ref/cppreference/en/cpp/string/bas...

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std::basic_string::substr - cppreference.com - University of Chicago

String containing the substring [pos, pos+count). std::out_of_range if pos > size() Linear in count.

https://en.cppreference.com/w/cpp/string/basic_string

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std::basic_string - cppreference.com

All member functions of std::basic_string are constexpr: it is possible to create and use std::basic_string objects in the evaluation of a constant expression. However, std::basic_string objects generally cannot be constexpr, because any dynamically allocated storage must be released in the same evaluation of constant expression.

https://en.cppreference.com/w/cpp/string

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Strings library - cppreference.com

When a user-defined character container type for std::basic_string and std::basic_string_view (since C++17) is used, it is also necessary to provide a corresponding character trait class (which can be a specialization of std::char_traits). The class template std::basic_string generalizes how sequences of characters are manipulated and stored.

https://stackoverflow.com/questions/46032307/how-to-efficiently-g...

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How to efficiently get a `string_view` for a substring of `std::string`

In which case the std::string_view::substr() method breaks its own rules, since it returns a string_view. So I guess the advice would be never to do this. Use a std::string. You can use the conversion operator from std::string to std::string_view: std::string s = "hello world!";

https://my.eng.utah.edu/~pajensen/ACM/Documentation/c-reference/e...

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std::basic_string::substr - cppreference.com

Returns a substring [pos, pos+count). If the requested substring lasts past the end of the string, or if count == npos, the returned substring is [pos, size ()). String containing the substring [pos, pos+count). std::out_of_range if pos > size(). Linear in count. Output:

https://tcs.rwth-aachen.de/docs/cpp/reference/en.cppreference.com...

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std::basic_string<CharT,Traits,Allocator>:: substr - RWTH Aachen University

Returns a substring [pos, pos+count). If the requested substring extends past the end of the string, i.e. the count is greater than size() - pos (e.g. if count == npos), the returned substring is [pos, size()). String containing the substring [pos, pos+count) or [pos, size()). std::out_of_range if pos > size() Linear in count.

https://cppreference-45864d.gitlab-pages.liu.se/en/cpp/string/bas...

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

If the requested substring extends past the end of the string, i.e. the count is greater than size ( ) - pos (e.g. if count == npos ), the returned substring is . pos . size() 1) Equivalent to return basic_string ( * this, pos, count ) ; . 2) Equivalent to return basic_string ( std :: move ( * this ) , pos, count ) ; . pos + count . or . pos .

https://documentation.help/CppReference/substr.html

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substr - C++ Reference Documentation

string substr( size_type index, size_type num = npos ); The substr () function returns a substring of the current string, starting at index, and num characters long. If num is omitted, it will default to string::npos, and the substr () function will simply return the remainder of the string starting at index.

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