Unknown error in array initialization: invalid in-class initialization of static data member of non- integral type `const unsigned char[256]'

I was trying to make a Intel 8080 CPU emulator (then I'd like to emulate Space Invaders, which use it).

I coded nearly complete implementation of this CPU (thanks to MAME and Ti开发者_运维知识库ckle project (mostly) ;) ) except undocument instructions (0x08, 0x10, 0x18, 0x20, 0x28, 0x30, 0x38, 0x0CB, 0x0D9, 0x0DD, 0x0ED, 0x0FD).

I've have only problems when I compile it, I don't know why.

This is the code:

static const unsigned char cycles_table[256] =
{
    /*                       8080's Cycles Table                         */
    /*     0   1   2   3   4   5   6   7   8   9   A   B   C   D   E   F */
    /*0*/  4, 10,  7,  5,  5,  5,  7,  4,  0, 10,  7,  5,  5,  5,  7,  4,
    /*1*/  0, 10,  7,  5,  5,  5,  7,  4,  0, 10,  7,  5,  5,  5,  7,  4,
    /*2*/  0, 10, 16,  5,  5,  5,  7,  4,  0, 10, 16,  5,  5,  5,  7,  4,
    /*3*/  0, 10, 13,  5, 10, 10, 10,  4,  0, 10, 13,  5,  5,  5,  7,  4,
    /*4*/  5,  5,  5,  5,  5,  5,  7,  5,  5,  5,  5,  5,  5,  5,  7,  5,
    /*5*/  5,  5,  5,  5,  5,  5,  7,  5,  5,  5,  5,  5,  5,  5,  7,  5,
    /*6*/  5,  5,  5,  5,  5,  5,  7,  5,  5,  5,  5,  5,  5,  5,  7,  5,
    /*7*/  7,  7,  7,  7,  7,  7,  7,  7,  5,  5,  5,  5,  5,  5,  7,  5,
    /*8*/  4,  4,  4,  4,  4,  4,  7,  4,  4,  4,  4,  4,  4,  4,  7,  4,
    /*9*/  4,  4,  4,  4,  4,  4,  7,  4,  4,  4,  4,  4,  4,  4,  7,  4,
    /*A*/  4,  4,  4,  4,  4,  4,  7,  4,  4,  4,  4,  4,  4,  4,  7,  4,
    /*B*/  4,  4,  4,  4,  4,  4,  7,  4,  4,  4,  4,  4,  4,  4,  7,  4,
    /*C*/  5, 10, 10, 10, 11, 11,  7, 11,  5, 10, 10,  0, 11, 17,  7, 11,
    /*D*/  5, 10, 10, 10, 11, 11,  7, 11,  5,  0, 10, 10, 11,  0,  7, 11,
    /*E*/  5, 10, 10, 18, 11, 11,  7, 11,  5,  5, 10,  4, 11,  0,  7, 11,
    /*F*/  5, 10, 10,  4, 11, 11,  7, 11,  5,  5, 10,  4, 11,  0,  7, 11
};

g++ takes me this error:

8080.h:521: error: invalid in-class initialization of static data member of non- integral type `const unsigned char[256]'

This array is in a class called i8080.

Like it says, you cannot initialize static non-integral types in a class definition. That is, you could do this:

static const unsigned value = 123;
static const bool value_again = true;

But not anything else.

What you should do is place this in your class definition:

static const unsigned char cycles_table[256];

And in the corresponding source file, place what you have:

const unsigned char i8080::cycles_table[256] = // ...

What this does is say (in the definition), "Hey, there's gonna be this array." and in the source file, "Hey, here's that array."

Static data members need to be initialised outside of the class.

You cannot initialize a static array embedded within a class like this:

class Thing
{
public:
    static const int [3] = {1, 2, 3};
};

You have to do it like this:

thing.h:

class Thing
{
public:
    static const int vals[3];;
};

thing.cpp:

const int Thing::vals[3] = {1, 2, 3};