std::rewind - cppreference.com (original) (raw)
Moves the file position indicator to the beginning of the given file stream.
The function is equivalent to std::fseek(stream, 0, SEEK_SET);, except that end-of-file and error indicators are cleared.
The function drops any effects from previous calls to ungetc.
[edit] Parameters
| stream | - | file stream to modify |
|---|
[edit] Return value
(none)
[edit] Example
#include #include 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