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Showing content from https://timsong-cpp.github.io/cppwp/n4140/ifstream.cons below:

[ifstream.cons]

27.9.1.7 basic_ifstream constructors [ifstream.cons]

basic_ifstream();

Effects: Constructs an object of class basic_ifstream<charT,traits>, initializing the base class with basic_istream(&sb) and initializing sb with basic_filebuf<charT,traits>()) ([istream.cons], [filebuf.cons]).

explicit basic_ifstream(const char* s, ios_base::openmode mode = ios_base::in);

Effects: Constructs an object of class basic_ifstream, initializing the base class with basic_istream(&sb) and initializing sb with basic_filebuf<charT, traits>()) ([istream.cons], [filebuf.cons]), then calls rdbuf()->open(s, mode | ios_base::in). If that function returns a null pointer, calls setstate(failbit).

explicit basic_ifstream(const string& s, ios_base::openmode mode = ios_base::in);

Effects: the same as basic_ifstream(s.c_str(), mode).

basic_ifstream(basic_ifstream&& rhs);

Effects: Move constructs from the rvalue rhs. This is accomplished by move constructing the base class, and the contained basic_filebuf. Next basic_istream<charT,traits>::set_rdbuf(&sb) is called to install the contained basic_filebuf.


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