basic_ifstream(); | (1) | |
explicit basic_ifstream( const char* filename, ios_base::openmode mode = ios_base::in ); | (2) | |
explicit basic_ifstream( const string& filename, ios_base::openmode mode = ios_base::in ); | (3) | (since C++11) |
basic_ifstream( basic_ifstream&& other ); | (4) | (since C++11) |
basic_ifstream( const basic_ifstream& rhs) = delete; | (5) | (since C++11) |
Constructs new file stream.
std::basic_filebuf
and constructs the base with the pointer to this default-constructed std::basic_filebuf
member.rdbuf()->open(filename, mode | std::ios_base::in)
(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)
.basic_ifstream(filename.c_str(), mode)
. 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.filename | - | the name of the file to be opened | ||||||||||||||
mode | - | specifies stream open mode. It is bitmask type, the following constants are defined:
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other | - | another file stream to use as source |
#include <fstream> #include <utility> #include <string> int main() { std::ifstream f0; std::ifstream f1("test.bin", std::ios::binary); std::string name = "example.txt"; std::ifstream f2(name); std::ifstream f3(std::move(f1)); }
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_istream ) |
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