| (1) | |||
| (2) | |||
| (3) | (since C++11) | ||
| (4) | (since C++11) | ||
| (5) | (since C++11) |
Constructs new file stream.
1) Default constructor: constructs a stream that is not associated with a file: default-constructs the
std::basic_filebuf and constructs the base with the pointer to this default-constructed std::basic_filebuf member. 2) First, performs the same steps as the default constructor, then associates the stream with a file by calling
rdbuf()->open(filename, mode) (see std::basic_filebuf::open for the details on the effects of that call). If the open() call returns a null pointer, sets setstate(failbit). 3) Same as
basic_fstream(filename.c_str(), mode). 4) Move constructor. First, move-constructs the base class from
other (which does not affect the rdbuf() pointer), then move-constructs the std::basic_filebuf member, then calls this->set_rdbuf() to install the new basic_filebuf as the rdbuf() pointer in the base class. 5) The copy-constructor is deleted: this class is not copyable.
Parameters
| filename | - | the name of the file to be opened | ||||||||||||||
| mode | - | specifies stream open mode. It is bitmask type, the following constants are defined:
| ||||||||||||||
| other | - | another file stream to use as source |
Example
1 2 3 4 5 6 7 8 9 10 11 | #include <fstream>#include <utility>#include <string>int main(){ std::fstream f0; std::fstream f1("test.bin", std::ios::binary); std::string name = "example.txt"; std::fstream f2(name); std::fstream f3(std::move(f1));} |
See also
| opens a file and associates it with the stream (public member function) | |
| opens a file and configures it as the associated character sequence (public member function of std::basic_filebuf) | |
replaces the rdbuf without clearing its error state (protected member function) | |
| constructs the object (public member function of std::basic_iostream) |
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