读取 C++ 中文本文件的最后一个空行

Question

I try

#include <iostream>
#include <fstream>
#include <vector>

using namespace std;

vector<string> readLines(string filename)
{
    ifstream infile(filename);
    vector<string> v;
    string line;
    bool good;
    do {
        good = getline(infile, line).good();
        if (!good) break; //<---- if exists, or not - is bad
        v.push_back(line);
    } while (good);
    return v;
}

int main() {
    auto v = readLines("test.txt");
    for (auto &line:v)
        cout << ">" << line << endl;
}

If I break loop, no last line in vector, if no break - add empty line although not in file. I want do precisely tests with test file and if exists last empty line is important.

Answer 1

Solution is simple:

#include <iostream>
#include <fstream>

#include <vector>
using namespace std;
vector<string> readLines(string filename)
{
    ifstream infile(filename);
    vector<string> v;
    string line;
    bool readedNewline;
    if (infile.peek() != EOF)
    while(true) {
        readedNewline = getline(infile, line).good();
        v.push_back(line);
        if (!readedNewline) break;
    }
    return v;
}

int main() {
    auto v = readLines("test.txt");
    for (auto &line:v)
        cout << ">" << line << endl;
}

getline().good() returns true if after line is newline char. Push to vector last not good(), thus I must check if file is not empty (peek())