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Showing content from https://en.cppreference.com/w/cpp/language/../preprocessor/../io/ios_base/openmode.html below:

std::ios_base::openmode - cppreference.com

typedef /* implementation defined */ openmode;

static constexpr openmode app = /* implementation defined */; static constexpr openmode binary = /* implementation defined */; static constexpr openmode in = /* implementation defined */; static constexpr openmode out = /* implementation defined */; static constexpr openmode trunc = /* implementation defined */; static constexpr openmode ate = /* implementation defined */;

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 [edit] 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:

[edit] See also opens a file and configures it as the associated character sequence
(public member function of std::basic_filebuf<CharT,Traits>) [edit] constructs a basic_stringbuf object
(public member function of std::basic_stringbuf<CharT,Traits,Allocator>) [edit]

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