公共成员函数：
default (1) ifstream();
initialization (2)
explicit ifstream (const char* filename, ios_base::openmode mode = ios_base::in);
explicit ifstream (const string& filename, ios_base::openmode mode = ios_base::in);
copy (3) ifstream (const ifstream&) = delete;
move (4) ifstream (ifstream&& x);
mode
member constant | stands for | access |
in* | input | File open for reading: the internal stream buffer |
out | output | File open for writing: the internal stream buffer |
binary | binary | Operations are performed in binary mode rather than text. |
ate | at end | The output position starts at the end of the file. |
app | append | All output operations happen at the end of the file, appending to its existing contents. |
trunc | truncate | Any contents that existed in the file before it is open are discarded. |
code
// ifstream constructor.
#include <iostream> // std::cout
#include <fstream> // std::ifstream
int main ()
{
std::ifstream ifs ("test.txt", std::ifstream::in);
char c = ifs.get();
while (ifs.good())
{
std::cout << c;
c = ifs.get();
}
ifs.close();
return 0;
}
参考
1.cplusplus.com;
完
