size.cpp

#include <iostream>     // std::cout

enum FruitType
{
    Apple,
    Pear,
};

int main () {
    FruitType enum_type = Pear;
    int int_type = 0;
    std::cout << "sizeof(FruitType)" << sizeof(enum_type) << std::endl;
    std::cout << "sizeof(int_type)" << sizeof(int_type) << std::endl;
    return 0;
}

[root@TENCENT64 /tmp]# g++ size.cpp
[root@TENCENT64 /tmp]# ./a.out
sizeof(FruitType)4
sizeof(int_type)4
[root@TENCENT64 /tmp]# g++ --version
g++ (GCC) 4.8.5 20150623 (Red Hat 4.8.5-5)
Copyright (C) 2015 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

D:\workspace>cl size.cpp
用于 x86 的 Microsoft (R) C/C++ 优化编译器 19.15.26730 版
版权所有(C) Microsoft Corporation。保留所有权利。

size.cpp
C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\VC\Tools\MSVC\14.15.26726\include\xlocale(319): warning C4530: 使用了 C++ 异常处理程序，但未启用展开语义。请指定 /EHsc
Microsoft (R) Incremental Linker Version 14.15.26730.0
Copyright (C) Microsoft Corporation. All rights reserved.

/out:size.exe
size.obj

D:\workspace>size.exe
sizeof(FruitType)4
sizeof(int_type)4