Fastest way to check if a file exist using standard C++/C++11/C?

Question

Fastest way to check if a file exist using standard C++/C++11/C?

I would want to discover the quickest method to verify if a file exists in standard C++11, C++, or C. I have thousands of files and before preparing something on them I need to examine if all of them exist. What can I write rather than / SOMETHING */ in the subsequent function?

inline bool exist(const std::string& name)

{

    /* SOMETHING /

}

file cpp

3 years ago by Bharatgxwzm

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**rahul07** · Answer 1 · 2021-05-15T13:50:24

Remark : in C++14 and as soon as the filesystem TS will be finished and adopted, the solution will be to use:



std::experimental::filesystem::exists("helloworld.txt");

and since C++17, only:



std::filesystem::exists("helloworld.txt");

**RoliMishra** · Answer 2 · 2021-05-17T14:55:17

I use this piece of code, it works OK with me so far.

bool is_file_exist(const char *fileName)

{

    std::ifstream infile(fileName);

    return infile.good();

}

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Fastest way to check if a file exist using standard C++/C++11/C?

2 Answers

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