我對所有的矢量名稱空間和如何正確地返回我的類中的字符串矢量有點困惑。下面是代碼:返回一個字符串矢量
的main.cpp
#include <fstream>
#include <iostream>
#include <stdlib.h>
#include <vector>
#include <string>
#include "lab1.h"
using namespace std;
readwords wordsinfile;
words wordslist;
int main (int argc, char *argv[])
{
if (argc != 2) {
// Looks like we have no arguments and need do something about it
// Lets tell the user
cout << "Usage: " << argv[0] <<" <filename>\n";
exit(1);
} else {
// Yeah we have arguements so lets make sure the file exists and it is readable
ifstream ourfile(argv[1]);
if (!ourfile.is_open()) {
// Then we have a problem opening the file
// Lets tell the user and exit
cout << "Error: " << argv[0] << " could not open the file. Exiting\n";
exit (1);
}
// Do we have a ASCII file?
if (isasciifile(ourfile)) {
cout << "Error: " << argv[0] << " only can handle ASCII or non empty files. Exiting\n";
exit(1);
}
// Let ensure we are at the start of the file
ourfile.seekg (0, ios::beg);
// Now lets close it up
ourfile.close();
}
// Ok looks like we have past our tests
// Time to go to work on the file
ifstream ourfile2(argv[1]);
wordsinfile.getwords(ourfile2);
lab1.h
#ifndef LAB1_H
#define LAB1_H
bool isasciifile(std::istream& file);
class readwords {
public:
int countwords(std::istream& file);
std::vector<std::string> getwords(std::istream& file);
};
class words {
public:
void countall(void);
void print(void);
};
#endif
lab1.cpp
#include <fstream>
#include <iostream>
#include <map>
#include "lab1.h"
#include <vector>
using std::vector;
#include <string>
using namespace std;
vector<string> readwords::getwords(std::istream& file) {
char c;
string aword;
vector<string> sv;
int i = 0;
while(file.good()) {
c = file.get();
if (isalnum(c)) {
if(isupper(c)) {
c = (tolower(c));
}
if(isspace(c)) { continue; }
aword.insert(aword.end(),c);
} else {
if (aword != "") {sv.push_back(aword);}
aword = "";
i++;
continue;
}
}
return sv;
}
以下是編譯錯誤。
g++ -g -o lab1 -Wall -pedantic main.cpp lab1.cpp
In file included from lab1.cpp:4:0:
lab1.h:9:4: error: ‘vector’ in namespace ‘std’ does not name a type
lab1.cpp:48:54: error: no ‘std::vector<std::basic_string<char> > readwords::getwords(std::istream&)’ member function declared in class ‘readwords’
make: *** [lab1] Error 1
爲什麼我得到這個錯誤,我該如何解決它。感謝您提供任何幫助。
瑞安
現在您可以查看錯誤消息,瞭解問題所在。它告訴你「lab1.cpp」的第4行包含一個名爲「lab1.h」的文件。該文件的第9行正在處理一些尚未定義的稱爲「矢量」的東西。 –