企业官网建设流程全解析

#include <string> #include <fstream> #include <sstream> class CsvStream { std::ofstream fs_; bool is_first_; const std::string separator_; const std::string escape_seq_; const std::string special_chars_; public: CsvStream(const std::string filename, const std::string separator = ",") : fs_() , is_first_(true) , separator_(separator) , escape_seq_("\"") , special_chars_("\"") { fs_.exceptions(std::ios::failbit | std::ios::badbit); fs_.open(filename.c_str()); } ~CsvStream() { flush(); fs_.close(); } void flush() { fs_.flush(); } inline static CsvStream& endl(CsvStream& file) { file.endrow(); return file; } void endrow() { fs_ << std::endl; is_first_ = true; } CsvStream& operator<<(CsvStream& (*val)(CsvStream&)) { return val(*this); } CsvStream& operator<<(const char* val) { return write(escape(val)); } CsvStream& operator<<(const std::string& val) { return write(escape(val)); } template<typename T> CsvStream& operator<<(const T& val) { return write(val); } private: template<typename T> CsvStream& write(const T& val) { if (!is_first_) { fs_ << separator_; } else { is_first_ = false; } fs_ << val; return *this; } std::string escape(const std::string& val) { std::ostringstream result; result << '"'; std::string::size_type to, from = 0u, len = val.length(); while (from < len && std::string::npos != (to = val.find_first_of(special_chars_, from))) { result << val.substr(from, to - from) << escape_seq_ << val[to]; from = to + 1; } result << val.substr(from) << '"'; return result.str(); } }; void test() { CsvStream file("test.csv"); file << "col1" << "col2" << "col3" << CsvStream::endl; file << "val1" << "val2" << "val3" << CsvStream::endl; file << "val1" << "val2" << "val3" << CsvStream::endl; file.flush(); }

输出

创作不易，小小的支持一下吧！