From cppreference.com
constexprconst_referenceoperator[](size_typepos)const;(since C++17)Returns a const reference to the character at specified location pos.
If pos<size() is false, the behavior is undefined.
(until C++26)If pos<size() is false:
If the implementation is
, a
occurs.
If the implementation is not hardened, the behavior is undefined.
(since C++26)Parameters
pos - position of the character to return Return value
[pos]
Exceptions
Does not throw.
Complexity
Constant.
Notes
Unlike
, std::basic_string_view::operator[](size()) does not return a reference to CharT().
Example
Run this code
#include<iostream>#include<string_view>intmain(){std::stringstr="Exemplar";std::string_viewv=str;std::cout<<v[2]<<'\n';// v[2] = 'y'; // Error: cannot modify through a string viewstr[2]='y';std::cout<<v[2]<<'\n';}Output:
e y See also
accesses the specified character with bounds checking
(public member function)
accesses the specified character
(public member function of std::basic_string<CharT,Traits,Allocator>)