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/Zc:zeroSizeArrayNew (Call member new/delete on arrays)

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The /Zc:zeroSizeArrayNew compiler option calls member new and delete for zero-length arrays of objects.

Syntax

/Zc:zeroSizeArrayNew[-]

Remarks

The /Zc:zeroSizeArrayNew compiler option enables calls to member new and delete for zero-length arrays of objects of class types with virtual destructors. This behavior conforms to the standard. This compiler option is new in Visual Studio 2019 version 16.9 and is enabled by default in all compiler modes. Previously, in code compiled by versions before Visual Studio 2019 version 16.9, the compiler invoked global new and delete on zero-length arrays of objects of class types with virtual destructors.

The /Zc:zeroSizeArrayNew option may cause a breaking change in code that relied on the previous non-conforming behavior. To restore the previous behavior, use the /Zc:zeroSizeArrayNew- compiler option.

To set this compiler option in Visual Studio

  1. Open the project's Property Pages dialog box. For details, see Set C++ compiler and build properties in Visual Studio.

  2. Select the Configuration Properties > C/C++ > Command Line property page.

  3. In Additional options, add /Zc:zeroSizeArrayNew or /Zc:zeroSizeArrayNew-. Choose OK or Apply to save your changes.

See also

/Zc (Conformance)