Редагувати

Поділитися через

IntPtr.Addition(IntPtr, Int32) Operator

  • Reference

Definition

Namespace:
System
Assembly:
System.Runtime.dll
Assembly:
mscorlib.dll
Assembly:
netstandard.dll
Source:
IntPtr.cs
Source:
IntPtr.cs
Source:
IntPtr.cs

Adds an offset to a signed integer.

public:
 static IntPtr operator +(IntPtr pointer, int offset);
public static IntPtr operator + (IntPtr pointer, int offset);
static member ( + ) : nativeint * int -> nativeint
Public Shared Operator + (pointer As IntPtr, offset As Integer) As IntPtr

Parameters

pointer
IntPtr

nativeint

The signed integer to add the offset to.

offset
Int32

The offset to add.

Returns

IntPtr

nativeint

A new signed integer that reflects the addition of offset to pointer.

Remarks

The Addition method defines the addition operation for IntPtr objects. It enables code such as the following.

int[] arr = {2, 4, 6, 8, 10, 12, 14, 16, 18, 20 };
unsafe {
   fixed(int* parr = arr)
   {
       IntPtr ptr = new IntPtr(parr);
       for (int ctr = 0; ctr < arr.Length; ctr++)
       {
          IntPtr newPtr = ptr + ctr * sizeof(Int32);
          Console.Write("{0}   ", Marshal.ReadInt32(newPtr));
       }
   }
}
// The example displays the following output:
//       2   4   6   8   10   12   14   16   18   20

#nowarn "9"
open System.Runtime.InteropServices
open FSharp.NativeInterop

[<EntryPoint>]
let main _ =
    let arr =
        [| 2; 4; 6; 8; 10; 12; 14; 16; 18; 20 |]
        
    use parr = fixed arr

    let ptr = NativePtr.toNativeInt parr

    for i = 0 to arr.Length - 1 do
        let newPtr = ptr + nativeint i * nativeint sizeof<int>
        printf $"{Marshal.ReadInt32 newPtr}   "
    0

    // The example displays the following output:
    //       2   4   6   8   10   12   14   16   18   20

Dim arr() As Integer = {2, 4, 6, 8, 10, 12, 14, 16, 18, 20 }
Dim ptr As IntPtr = Marshal.UnsafeAddrOfPinnedArrayElement(arr, 0)
For ctr As Integer = 0 To arr.Length - 1
   Dim newPtr As IntPtr = ptr + ctr * Len(arr(0))
   Console.WriteLine("{0}   ", Marshal.ReadInt32(newPtr))
Next
' The example displays the following output:
'       2   4   6   8   10   12   14   16   18   20

Languages that do not support custom operators can call the Add method instead.

The addition operation does not throw an exception if the result is too large to represent as a signed integer in the executing process. Instead, it is performed in an unchecked context.

In C# starting from version 11 and when targeting the .NET 7 or later runtime, this API is only accessible via reflection. The addition operator is directly recognized by the language and will follow the normal language behavior for addition operations, including overflowing in a checked context if the result is too large to represent.

The equivalent method for this operator is IntPtr.Add(IntPtr, Int32)

Applies to

See also