C++判斷大小端

 

bool isLittleEndian()
{
    union U
    {
        int  i;
        char c;
    };
    U u;
    u.i = 1;
    return u.c == 1;
}

// 或者

bool isLittleEndian()
{
    union U
    {
        int  i;
        char c;
    };
    U u;
    u.i = 0x12345678;
    return u.c == 0x78;
}