c++ - 符号引用错误

Question

我正在写一个关于 alpha-beta 修剪的项目。当我在 xcode 中运行它时，我得到符号引用错误：

  Undefined symbols for architecture x86_64:
  "Eval(Node*)", referenced from:
      AlphaBeta(int, int&, int, int, int, Node*) in main.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

我的一些代码：

struct Node
{
    char name[1];
    int empty;// YES or NO
    double  value;
};

int eval(Node ptr[]) {
 //some stuff   
}

int AlphaBeta (int player, int &bestMove, int alpha, int beta, int bsize, Node ptr[]) {
//some stuff, and then i call Evaluation function

int value = Eval(ptr);
//some stuff
}
int main (int argc, const char * argv[])
{

    int size  = 4;
    Node board[size*size];
// some stuff
    int score = AlphaBeta(RED, move, a, b, size, board);
    return 0;
}

Answer 1

你有一个错字：

int eval(Node ptr[])

是函数的定义方式，但是你调用

Eval(ptr);
^
+- this was a lowercase 'e' in the definition!

稍后 - 请记住 C 和 C++ 区分大小写。