size_t writeFile(const vector<char>& buffer, const string& outPath)
{
    ofstream file(outPath, ios::binary);
    file.write(&buffer[0], buffer.size());
    return (size_t)file.tellp();
}

size_t sync_copyFile(const string& inFile, const string& outFile)
    {
        return writeFile(readFile(inFile), outFile);
    }

    task<size_t> ppl_copyFile(const string& inFile, const string& outFile)
    {
        return Concurrency::create_task([inFile]()
    {
        return readFile(inFile);
    })
    .then([outFile](const vector<char>& buffer)
    {
        return writeFile(buffer, outFile);
    });

}