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title Compiler Error C2466
description Learn more about: Compiler Error C2466
ms.date 03/19/2025
f1_keywords
C2466
helpviewer_keywords
C2466

Compiler Error C2466

cannot allocate an array of constant size 0

Remarks

An array is allocated or declared with size zero. The constant expression for the array size must be an integer greater than zero. An array declaration with a zero subscript is legal only for a class, structure, or union member and only with Microsoft extensions (/Ze).

Example

The following example generates C2466:

// C2466.cpp
// compile with: /c
int arr1[0];   // C2466
int arr2[1];   // OK