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preetam
preetam

Reputation: 1587

Why does my c++ code using ofstream fail to crete the file on /tmp subdirectory?

The following code fails to create the file on /tmp. This happens even if I execute the binary as sudo

#include <iostream>
#include <fstream>

using namespace std;

int main()
{
        ofstream of("/tmp/DIR1/DIR2/test_file",std::ios::out | std::ios::trunc);
        of.close();
        return 0;
}

If I remove DIR1/DIR2/ from the file path, a test_file does get created on /tmp. I am using linux mint.

Whats happening here?

Upvotes: 0

Views: 126

Answers (1)

walnut
walnut

Reputation: 22152

The C++ file streams do not create directories, only files.

Before C++17 there is no standard function to create directories and you will have to use a OS specific function or an additional library, such as mkdir on POSIX systems or CreateDirectory on Windows, or boost::filesystem::create_directory and others from the Boost library.

Since C++17 there is a filesystem library in the standard. Specifically you would want to took at e.g. std::filesystem::create_directory.

Upvotes: 1

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