将数组指针传递给函数

Question

I have a Node* hands[4]; and want to pass it into a function called Deal like Deal(deck,hands,4,"one-at-a-time",13);

When I use the following function...

void Deal(Node *deck, Node *hands[], int num_hands, const std::string &type, int num_cards)

I get this...

/tmp/ccqckP1I.o:main.cpp:(.text+0x82a): undefined reference to `CutDeck(Node*, Node*&, Node*&, std::string const&)'
/tmp/ccqckP1I.o:main.cpp:(.text+0xb34): undefined reference to `DeleteAllCards(Node*&)'
/tmp/ccqckP1I.o:main.cpp:(.text+0xb3f): undefined reference to `DeleteAllCards(Node*&)'
/tmp/ccqckP1I.o:main.cpp:(.text+0x1030): undefined reference to `DeleteAllCards(Node*&)'
/tmp/ccqckP1I.o:main.cpp:(.text+0x103e): undefined reference to `DeleteAllCards(Node*&)'
/tmp/ccqckP1I.o:main.cpp:(.text+0x104c): undefined reference to `DeleteAllCards(Node*&)'
/tmp/ccqckP1I.o:main.cpp:(.text+0x105a): more undefined references to `DeleteAllCards(Node*&)' follow
/tmp/ccqckP1I.o:main.cpp:(.text+0x1348): undefined reference to `CutDeck(Node*, Node*&, Node*&, std::string const&)'
/tmp/ccqckP1I.o:main.cpp:(.text+0x1492): undefined reference to `CutDeck(Node*, Node*&, Node*&, std::string const&)'
/tmp/ccqckP1I.o:main.cpp:(.text+0x15dc): undefined reference to `CutDeck(Node*, Node*&, Node*&, std::string const&)'
/tmp/ccqckP1I.o:main.cpp:(.text+0x1726): undefined reference to `CutDeck(Node*, Node*&, Node*&, std::string const&)'
/tmp/ccqckP1I.o:main.cpp:(.text+0x1870): undefined reference to `CutDeck(Node*, Node*&, Node*&, std::string const&)'
/tmp/ccqckP1I.o:main.cpp:(.text+0x1c2d): more undefined references to `CutDeck(Node*, Node*&, Node*&, std::string const&)' follow
/tmp/ccqckP1I.o:main.cpp:(.text+0x1f8c): undefined reference to `DeleteAllCards(Node*&)'
/tmp/ccqckP1I.o:main.cpp:(.text+0x1f9a): undefined reference to `DeleteAllCards(Node*&)'
/tmp/ccqckP1I.o:main.cpp:(.text+0x1fa8): undefined reference to `DeleteAllCards(Node*&)'
/tmp/ccqckP1I.o:main.cpp:(.text+0x1fb6): undefined reference to `DeleteAllCards(Node*&)'
/tmp/ccqckP1I.o:main.cpp:(.text+0x1fc4): undefined reference to `DeleteAllCards(Node*&)'
/tmp/ccqckP1I.o:main.cpp:(.text+0x1fd2): more undefined references to `DeleteAllCards(Node*&)' follow
/usr/lib/gcc/i686-pc-cygwin/4.7.3/../../../../i686-pc-cygwin/bin/ld: /tmp/ccqckP1I.o: bad reloc address 0x1b in section `.text$_ZNSt11char_traitsIcE7compareEPKcS2_j[__ZNSt11char_traitsIcE7compareEPKcS2_j]'
collect2: error: ld returned 1 exit status

Answer 1

The following prototype (the first variant you mentioned) is correct:

void Deal(Node *deck,
          Node *hands[],
          int num_hands,
          const std::string &type,
          int num_cards);

when used for example like this:

Node n;
Node* deck = &n;
Node* hands[4];
Deal(deck, hands, 4, "one-at-a-time", 13);

just note that hands in this case is just an array of pointers that don't point to any instances of Node yet. Make sure they point to valid objects before you try to use them:

for (int i = 0; i < num_hands; ++i)
    hands[i] = new Node();

Answer 2

Node [] *hands

...should be

Node* hands[]

or

Node** hands

Answer 3

One of the solutions is

Deal(Node *deck, Node **hands, int num_hands, const std::string &type, int num_cards)

You can call as you have in your example.