std::basic_string_view<CharT,Traits>::at
From cppreference.com
< cpp | string | basic string view
constexpr const_reference at(size_type pos) const; |
(since C++17) | |
Returns a reference to the character at specified location pos
. Bounds checking is performed, exception of type std::out_of_range will be thrown on invalid access.
Parameters
pos | - | position of the character to return |
Return value
Reference to the requested character.
Exceptions
Throws std::out_of_range if pos >= size().
Complexity
Constant.
Example
Run this code
#include <iostream> #include <stdexcept> #include <string_view> int main() { std::string_view str_view("abcdef"); try { for (std::size_t i = 0; true; ++i) std::cout << i << ": " << str_view.at(i) << '\n'; } catch (const std::out_of_range& e) { std::cout << "Whooops. Index is out of range.\n"; std::cout << e.what() << '\n'; } }
Possible output:
0: a 1: b 2: c 3: d 4: e 5: f 6: Whooops. Index is out of range. basic_string_view::at: __pos (which is 6) >= this->size() (which is 6)
See also
accesses the specified character (public member function) |