C++ get file size

1/
#include <fstream>

std::ifstream::pos_type filesize(const char* filename)
{
    std::ifstream in(filename, std::ifstream::ate | std::ifstream::binary);
    return in.tellg(); 
}


2/

#include <fstream>

int getFileSize(const std::string &fileName) { ifstream file(fileName.c_str(), ifstream::in | ifstream::binary); if(!file.is_open()) { return -1; } file.seekg(0, ios::end); int fileSize = file.tellg(); file.close(); return fileSize; }