C++文件读取过程中跳过注释或特定行

#include <iostream><br>#include <fstream><br>#include <string><br><br>int main() {<br>    std::ifstream file("data.txt");<br>    std::string line;<br><br>    while (std::getline(file, line)) {<br>        // 跳过空行<br>        if (line.empty()) continue;<br><br>        // 去除行首空白（可选）<br>        size_t firstNonSpace = line.find_first_not_of(" \t");<br>        if (firstNonSpace == std::string::npos) continue; // 全是空白<br><br>        char firstChar = line[firstNonSpace];<br><br>        // 跳过以 # 或 / 开头的注释行<br>        if (firstChar == '#' || (firstChar == '/' &&<br>            firstNonSpace + 1 < line.size() &&<br>            line[firstNonSpace + 1] == '/')) {<br>            continue;<br>        }<br><br>        // 处理有效行<br>        std::cout << "Data: " << line << std::endl;<br>    }<br>    file.close();<br>    return 0;<br>}

if (line.find("SKIP") != std::string::npos) continue;<br>if (line.substr(firstNonSpace, 5) == "DEBUG") continue;

bool isCommentOrBlank(const std::string& line) {<br>    size_t first = line.find_first_not_of(" \t");<br>    if (first == std::string::npos) return true; // 空或全空白<br><br>    char ch = line[first];<br>    if (ch == '#') return true;<br>    if (ch == '/' && first + 1 < line.size() && line[first + 1] == '/') return true;<br>    return false;<br>}

while (std::getline(file, line)) {<br>    if (isCommentOrBlank(line)) continue;<br>    std::cout << "Valid line: " << line << std::endl;<br>}