cppreference.com 创建账户 页面 讨论 变换 查看 编辑 历史 std::basic_ifstream 在标头<fstream>定义 template< classCharT, classTraits=std::char_traits<CharT> >classbasic_ifstream:publicstd::basic_istream<CharT, Traits> 类模板basic_ifstream实现文件流上的高层输入操作。它将std::basic_istream的高层接口...
int main() { std::string path = ... // insert path to test file here std::ifstream ifs(path.c_str()); if(!ifs) { std::cout << "Failed to open the file." << std::endl; return EXIT_FAILURE; } int n = 0; std::string t; while(!safeGetline(ifs, t).eof()) ++n; st...
#include <fstream> #include <iostream> #include <string> // 此文件名为 main.cpp bool file_exists(const std::string& str) { std::ifstream fs(str); return fs.is_open(); } int main() { std::boolalpha(std::cout); std::cout << file_exists("main.cpp") << '\n' << file_exist...
basic_ifstream::swap (C++11) basic_ifstream::rdbuf basic_ifstream::native_handle (C++26) File operations basic_ifstream::is_open basic_ifstream::open basic_ifstream::close Non-member functions swap(std::basic_ifstream) (C++11) native_handle_type native_handle() const noexcept; (since C++...
basic_ifstream::rdbuf basic_ifstream::native_handle (C++26) File operations basic_ifstream::is_open basic_ifstream::open basic_ifstream::close Non-member functions swap(std::basic_ifstream) (C++11) basic_ifstream& operator=( basic_ifstream&& other ); (since C++11) Move assigns the file str...
basic_ifstream( const basic_ifstream& rhs) = delete; (7) (since C++11) 构造新的文件流。 1%29默认构造函数:构造与文件无关的流:默认构造std::basic_filebuf并使用指向此默认构造的指针构造基。std::basic_filebuf会员。 2-3%29首先执行与默认构造函数相同的步骤,然后通过调用将流与文件关联。rdbuf()->...
basic_ifstream(); (1) explicitbasic_ifstream(constchar*filename, std::ios_base::openmodemode=ios_base::in); (2) explicitbasic_ifstream(conststd::filesystem::path::value_type*filename, std::ios_base::openmodemode=ios_base::in); ...
std::basic_ifstream::close std::basic_ifstream::is_open std::basic_ifstream::open std::basic_ifstream::rdbuf std::basic_ifstream::swap std::basic_ios std::basic_ios::bad std::basic_ios::basic_ios std::basic_ios::clear std::basic_ios::copyfmt ...
文件和流I/O: 例如,C++ 的文件流(如 std::ofstream, std::ifstream)不能被复制,但可以被移动,从而允许在函数间传递或从函数返回文件流对象,而不用担心资源管理问题。 网络库(如 Boost.Asio, libcurl): 网络库在处理数据包、连接或会话时,频繁使用移动操作来避免不必要的数据复制,提高网络通信的效率。 数据库...
修正后的代码: cpp std::ifstream file("example.txt"); // 使用正确的文件路径字符串 通过遵循以上步骤,你应该能够解决关于std::basic_ifstream构造函数调用不匹配的问题。如果问题仍然存在,请检查是否有其他语法错误或配置问题影响了编译过程。