以下代码使用以下代码进行流畅编译
g++ -I. -std=c++0x -Wall -g -Werror *.cpp -o main
但如果没有 -std=c++0x 开关，它会说
main.cpp: In constructor ‘Out<T>::Out(const string&) [with T = double, std::string = std::basic_string<char>]’:
main.cpp:274:42: instantiated from here
main.cpp:34:113: erreur: no matching function for call to ‘std::basic_ofstream<char>::basic_ofstream(const string&, std::_Ios_Openmode)’
main.cpp:34:113: note: candidates are:
/usr/include/c++/4.6/fstream:629:7: note: std::basic_ofstream<_CharT, _Traits>::basic_ofstream(const char*, std::ios_base::openmode) [with _CharT = char, _Traits = std::char_traits<char>, std::ios_base::openmode = std::_Ios_Openmode]
/usr/include/c++/4.6/fstream:629:7: note: no known conversion for argument 1 from ‘const string {aka const std::basic_string<char>}’ to ‘const char*’
/usr/include/c++/4.6/fstream:614:7: note: std::basic_ofstream<_CharT, _Traits>::basic_ofstream() [with _CharT = char, _Traits = std::char_traits<char>]
/usr/include/c++/4.6/fstream:614:7: note: candidate expects 0 arguments, 2 provided
/usr/include/c++/4.6/fstream:588:11: note: std::basic_ofstream<char>::basic_ofstream(const std::basic_ofstream<char>&)
/usr/include/c++/4.6/fstream:588:11: note: candidate expects 1 argument, 2 provided
我怎样才能在没有 c++0x 开关的情况下编译它？
Code :
template <typename T>
class Out
{
public:
Out(const std::string& outputFilename) : m_file(outputFilename, std::ios_base::out | std::ios_base::app) {}
void write(const std::string &text)
{ m_file << text << "\n"; }
void flush() { m_file << std::flush; }
void fake(T t) { std::cout << t << std::endl; }
private:
std::ofstream m_file;
};
在 C++11 之前 ofstream 没有接受 a 的构造函数std::string。你需要char const*构造函数：m_file (outputFilename.c_str())
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