Json.nul

constexpr Nul& nul() & ;
constexpr Nul&& nul() && ;
constexpr const Nul& nul() const & ;
constexpr const Nul&& nul() const && ;

Returns a reference to the internal Nul value.

Return Value
Returns a reference with matching const/volatile qualification and value category (lvalue/rvalue) to the Nul value

Exceptions
Throws std::bad_variant_access if the stored value is not null

Complexity
Constant time O(1)

Version

Since v3.0.0 .