std::ios_base::openmode
From cppreference.com
| typedef /*implementation defined*/ openmode; |
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| static constexpr openmode app = /*implementation defined*/ static constexpr openmode binary = /*implementation defined*/ |
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| static constexpr openmode noreplace = /*implementation defined*/ |
(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
Run this code
#include <fstream> int main() { std::ofstream f("test.txt", std::ios::out | std::ios::app); f << "Hi\n"; }
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>)
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