std::string_view at() method
- od C++17
// Const version only
constexpr const_reference at( size_type pos ) const;
Returns a reference
to the character at specified indexpos
.
Bounds checking is performed.
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 - O(1).
Example
#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)
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