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std::rewind(3) C++ Standard Libary std::rewind(3) NAME std::rewind - std::rewind Synopsis Defined in header <cstdio> void rewind( std::FILE* stream ); Moves the file position indicator to the beginning of the given file stream. The function is equivalent to std::fseek(stream, 0, SEEK_SET);, ex- cept that end-of-file and error indicators are cleared. The function drops any effects from previous calls to ungetc. Parameters stream - file stream to modify Return value (none) Example // Run this code #include <array> #include <cstdio> int main() { std::FILE* f = std::fopen("file.txt", "w"); for (char ch = '0'; ch <= '9'; ch++) std::fputc(ch, f); std::fclose(f); std::array<char, 20> str; std::FILE* f2 = std::fopen("file.txt", "r"); const unsigned size1 = std::fread(str.data(), 1, str.size(), f2); std::puts(str.data()); std::printf("size1 = %u\n", size1); std::rewind(f2); const unsigned size2 = std::fread(str.data(), 1, str.size(), f2); std::puts(str.data()); std::printf("size2 = %u", size2); std::fclose(f2); } Output: 0123456789 size1 = 10 0123456789 size2 = 10 See also fseek moves the file position indicator to a specific location in a file (function) C documentation for rewind http://cppreference.com 2024.06.10 std::rewind(3)
NAME | Synopsis | Parameters | Return value | Example | Output: | See also
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