C++函数似乎不能计算文本文件中的空格数量

#include <fstream>
#include <iostream>
#include <string>
#include <algorithm>

int main() {
    std::ifstream file("example.txt");
    std::string line;
    int spaceCount = 0;

    if (file.is_open()) {
        while (std::getline(file, line)) {
            spaceCount += std::count(line.begin(), line.end(), ' ');
        }
        file.close();
    } else {
        std::cout << "Unable to open file." << std::endl;
        return 1;
    }

    std::cout << "Number of spaces in the file: " << spaceCount << std::endl;

    return 0;
}