Jon Jagger
jon@jaggersoft.com
Table of Contents 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 Notes DownloadECMA-334 C# Language Specificationpreviousnextprevious at this levelnext at this level 25 Unsafe codeprevious at this levelnext at this level 25.5 Pointers in expressionsprevious at this levelnext at this level 25.5.8 The sizeof operator Paragraph 11 The sizeof operator returns the number of bytes occupied by a variable of a given type. 2 The type specified as an operand to sizeof must be an unmanaged-type (§25.2). sizeof-expression : sizeof ( unmanaged-type ) Paragraph 21 The result of the sizeof operator is a value of type int. 2 For certain predefined types, the sizeof operator yields a constant value as shown in the table below.
Expression Result
sizeof(sbyte) 1
sizeof(byte) 1
sizeof(short) 2
sizeof(ushort) 2
sizeof(int) 4
sizeof(uint) 4
sizeof(long) 8
sizeof(ulong) 8
sizeof(char) 2
sizeof(float) 4
sizeof(double) 8
sizeof(bool) 1
Paragraph 31 For all other types, the result of the sizeof operator is implementation-defined and is classified as a value, not a constant. Paragraph 41 The order in which members are packed into a struct is unspecified. Paragraph 51 For alignment purposes, there may be unnamed padding at the beginning of a struct, within a struct, and at the end of the struct. 2 The contents of the bits used as padding are indeterminate. Paragraph 61 When applied to an operand that has struct type, the result is the total number of bytes in a variable of that type, including any padding.
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