/var/tmp//cc1Canw1.o: In function `main':
main.cc:(.text+0x184): undefined reference to
`Wordoku::valid( std::vector< std::basic_string<char, std::char_traits<char>, std::allocator<char> >,
std::allocator<std::basic_string<char, std::char_traits<char>, > std::allocator<char> > > > const&,
std::basic_string<char, std::char_traits<char>, >std::allocator<char> > const& )'
collect2: ld returned 1 exit status
这是我的代码：
main.cc
#include <iostream>
#include <string>
#include <vector>
#include "Wordoku.h"
#include <cassert>
using namespace std;
int main() {
Wordoku obj;
int i=1;
while (!cin.eof()) {
string letters;
cin >> letters;
//cout << letters << endl;
if (!cin.fail()) {
assert(letters.length()==9);
vector<string> board;
for (int j=0;j<9;j++) {
string t;
cin >> t;
board.push_back(t);
}
bool res;
cin >> res;
//cout << res << endl;
if (obj.valid(board, letters)==res) {
cout << "Test " << i << " passed" << endl;
}
else {
cout << "Test " << i << " failed" << endl;
}
i++;
}
}
}
Wordoku.h
//include the string, vector, and algorithm (used for sort) std libraries
#ifndef _WORDOKU_H
#define _WORDOKU_H
#include <vector>
#include <string>
//define the class Wordoku
class Wordoku{
//no private variables or functions, 1 public function
public:
//valid tests if wordoku_board matches the definition of a completed wordoku board
bool valid(const vector<string> &wordoku_board, const string &letters);
};
#endif // WORDOKU_H
Wordoku.cc
//include the string, vector, and algorithm (used for sort) std libraries
#include <vector>
#include <string>
#include <algorithm>
#include "Wordoku.h"
using namespace std;
bool Wordoku::valid(const vector<string> &wordoku_board, const string &letters)
{
//string used to test individual rows and columns against letters
string current;
//for each row
for (int i = 0; i < 9; i++)
{
//set current = the row
current = wordoku_board[i];
//sort current so that the letters are in order
sort(current.begin(), current.end());
//test current against letters, return 0 if test fails
if (current != letters)
return 0;
}
//potential cout for debugging
//cout << "Rows are checked." << endl;
//for each column
for (int k = 0; k < 9; k++)
{
//give current an initial value
current = wordoku_board[0][k];
//for each row starting at row 2
for (int l = 1; l < 9; l++)
//add the element to current
current += wordoku_board[l][k];
//sort current so the letters are in order
sort(current.begin(), current.end());
//test current against letters, return 0 if test fails
if (current != letters)
return 0;
}
//potential cout for debugging
//cout << "Columns are checked." << endl;
//string array to test 3x3 nodes of board
string square[9];
//for each node
for (int j = 0; j < 9; j++)
{
//if one of the first 3 nodes
if (j < 3)
//give node j its first value
square[j] = wordoku_board[0][j*3];
//if one of the second 3 nodes
else if (j >= 3 && j < 6)
//give node j its first value
square[j] = wordoku_board[3][(j-3)*3];
//if one of the last 3 nodes
else
//give node j its first value
square[j] = wordoku_board[6][(j-6)*3];
}
//for each node
for (int m = 0; m < 9; m++)
{
//for each value in node m starting at the second value
for (int n = 1; n < 9; n++)
{
//if one of the first 3 nodes
if (m < 3)
{
//if one of the first 3 values
if (n < 3)
//append the desired value to node m
square[m] += wordoku_board[0][n+(m*3)];
//if one of the second 3 values
else if (n >= 3 && n < 6)
//append the desired value to node m
square[m] += wordoku_board[1][(n-1)+(m*3)];
//if one of the last 3 values
else
//append the desired value to node m
square[m] += wordoku_board[2][(n-1)+(m*3)];
}
//if one of the second 3 nodes
else if (m >= 3 && m < 6)
{
//if one of the first 3 values
if (n < 3)
//append the desired value to node m
square[m] += wordoku_board[3][n+((m-3)*3)];
//if one of the second 3 values
else if (n >= 3 && n < 6)
//append the desired value to node m
square[m] += wordoku_board[4][(n-1)+((m-3)*3)];
//if one of the last 3 values
else
//append the desired value to node m
square[m] += wordoku_board[5][(n-1)+((m-3)*3)];
}
//if one of the last 3 nodes
else
{
//if one of the first 3 values
if (n < 3)
//append the desired value to node m
square[m] += wordoku_board[6][n+((m-6)*3)];
//if one of the second 3 values
else if (n >= 3 && n < 6)
//append the desired value to node m
square[m] += wordoku_board[7][(n-1)+((m-6)*3)];
//if one of the last 3 values
else
//append the desired value to node m
square[m] += wordoku_board[8][(n-1)+((m-6)*3)];
}
}
}
//for each node
for (int r = 0; r < 9; r++)
{
//sort the node so the letters are in order
sort(square[r].begin(), square[r].end());
//test the node against letters, return 0 if the test fails
if (square[r] != letters)
return 0;
}
//potential cout for debugging
//cout << "All 3 criteria have been met, board is a viable wordoku board." << endl;
//wordoku board has matched all criteria, return 1
return 1;
}
非常感谢任何帮助或建议，提前谢谢！
答案 0 :(得分：1)
std::vector和std::string是std命名空间的成员。
在标题中，您忘了：
bool valid(const std::vector<std::string> &wordoku_board, const std::string &letters);
// ^^^^^ ^^^^^ ^^^^^
您的源文件没问题，因为您执行了using namespace std;。不要在头文件中执行此操作，它是bad practice。
PS：我在计算机上尝试了您的代码并添加std::解决了所有问题。