An interesting question, what is the size of an empty struct in C/C++?

This question was discussed here.

I did a research and found,

Visual Studio 2008 (compile as C)	Not allowed. Prompt that C requires Struct or unoin has at least one member.
Visual Studio 2008 (compile as C++)	1
GCC	0 (sizeof should be followed by a variable, instead of a struct name)
G++	1

Summary: In C++, empty struct is size 1. In C, it is somehow meaningless. 
Actually, struct is treated as class in C++ and so empty struct is also allowed. Without any member or functions, the size of a class/struct is 1.

Tags: C/C++

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