Nullable<T> Record

Definition

A nullable type can represent the normal range of values for its underlying value type, plus an additional Null value.

Delphi

type Nullable<T> = record

The underlying value type of the Nullable<T> generic type.

Create(T)	Initializes a new instance of the Nullable<T> structure to the specified value.
Create(Variant)	Initializes a new instance of the Nullable<T> structure to the specified value.

HasValue	Gets a value indicating whether the current Nullable<T> structure has a value.
Value	Gets the value of the current Nullable<T> value.

Equals(Nullable<T>)	Determines whether two nullable value are equal.
GetValueOrDefault	Retrieves the value of the current Nullable<T> object, or the object's default value.
GetValueOrDefault(T)	Retrieves the value of the current Nullable<T> object, or the specified default value.
ToString
ToVariant	Returns the stored value as variant.
TryGetValue(T)	Gets the stored value. Returns `False` if it does not contain a value.

Equal(Nullable<T>, Null)
Equal(Nullable<T>, Nullable<T>)
Equal(Nullable<T>, T)
Explicit(Nullable<T> to T)
Explicit(Variant to Nullable<T>)
Implicit(Null to Nullable<T>)
Implicit(Nullable<T> to T)
Implicit(T to Nullable<T>)
NotEqual(Nullable<T>, Null)
NotEqual(Nullable<T>, Nullable<T>)
NotEqual(Nullable<T>, T)