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std::filesy...try::exists(3) C++ Standard Libary std::filesy...try::exists(3) NAME std::filesystem::directory_entry::exists - std::filesystem::direc- tory_entry::exists Synopsis bool exists() const; (1) (since C++17) bool exists( std::error_code& ec ) const noexcept; (2) (since C++17) Checks whether the pointed-to object exists. Effectively returns: 1) std::filesystem::exists(status()), 2) std::filesystem::exists(status(ec)). Note that status() follows symlinks to their targets. Parameters ec - out-parameter for error reporting in the non-throwing overload Return value true if the referred-to filesystem object exists. Exceptions Any overload not marked noexcept may throw std::bad_alloc if memory allocation fails. 1) Throws std::filesystem::filesystem_error on underlying OS API er- rors, constructed with p as the first path argument and the OS error code as the error code argument. 2) Sets a std::error_code& parameter to the OS API error code if an OS API call fails, and executes ec.clear() if no errors occur. Example // Run this code #include <filesystem> #include <iostream> int main() { for (auto const str: { "/usr/bin/cat", "/usr/bin/mouse", "/usr/bin/python", "/usr/bin/bison", "/usr/bin/yacc", "/usr/bin/c++", }) { std::filesystem::directory_entry entry{str}; std::cout << "directory entry " << entry << (entry.exists() ? " exists\n" : " does not ex- ist\n"); } } Possible output: // Output on a POSIX system: directory entry "/usr/bin/cat" exist directory entry "/usr/bin/mouse" does not exist directory entry "/usr/bin/python" exists directory entry "/usr/bin/bison" exists directory entry "/usr/bin/yacc" does not exist directory entry "/usr/bin/c++" exists See also exists checks whether path refers to existing file system object (C++17) (function) http://cppreference.com 2024.06.10 std::filesy...try::exists(3)
NAME | Synopsis | Parameters | Return value | Exceptions | Example | Possible output: | See also
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