米6体育平台手机版

SLAU132V October 2004 – February 2020

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5.12.26 The pack Pragma

The pack pragma can be used to control the alignment of fields within a class, struct, or union type. The syntax of the pragma in C/C++ can be any of the following.

#pragma pack (n)

The above form of the pack pragma affects all class, struct, or union type declarations that follow this pragma in a file. It forces the maximum alignment of each field to be the value specified by n. Valid values for n are 1, 2, 4, 8, and 16 bytes.

#pragma pack ( push, n)

#pragma pack ( pop )

The above form of the pack pragma affects only class, struct, and union type declarations between push and pop directives. (A pop directive with no prior push results in a warning diagnostic from the compiler.) The maximum alignment of all fields declared is n. Valid values for n are 1, 2, 4, 8, and 16 bytes.

#pragma pack ( show )

The above form of the pack pragma sends a warning diagnostic to stderr to record the current state of the pack pragma stack. You can use this form while debugging.

For more about packed fields, see Section 5.17.4.