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std::basic_string_view<CharT,Traits>::front

From cppreference.com
 
C++
 
Strings library
 
std::basic_string_view
 
constexpr const_reference front() const;
 (since C++17)

Returns reference to the first character in the view.

If empty() is true, the behavior is undefined.

(until C++26)

If empty() is true:

  • If the implementation is hardened, a contract violation occurs. Moreover, if the contract-violation handler returns under “observe” evaluation semantic, the behavior is undefined.
  • If the implementation is not hardened, the behavior is undefined.
(since C++26)

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