std::ios_base:: openmode
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typedef
/* implementation defined */
openmode
;
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||
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static
constexpr
openmode app
=
/* implementation defined */
;
static
constexpr
openmode binary
=
/* implementation defined */
;
|
||
|
static
constexpr
openmode noreplace
=
/* implementation defined */
;
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(since C++23) | |
Specifies available file open flags. It is a BitmaskType , the following constants are defined:
| Constant | Explanation |
| app | seek to the end of stream before each write |
| binary | open in binary mode |
| in | open for reading |
| out | open for writing |
| trunc | discard the contents of the stream when opening |
| ate | seek to the end of stream immediately after open |
| noreplace (C++23) | open in exclusive mode |
Example
#include <fstream> #include <iostream> #include <string> int main() { const char* fname = "unique_name.txt"; // write to a temporary stream object std::fstream(fname, std::ios::out | std::ios::trunc) << "Hi"; std::string s; std::fstream(fname, std::ios::in) >> s; std::cout << s << '\n'; }
Output:
Hi
See also
|
opens a file and configures it as the associated character sequence
(public member function of
std::basic_filebuf<CharT,Traits>
)
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|
constructs a
basic_stringbuf
object
(public member function of
std::basic_stringbuf<CharT,Traits,Allocator>
)
|