std::atoll with VC++

Question

I have been using std::atoll from cstdlib to convert a string to an int64_t with gcc. That function does not seem to be available on the Windows toolchain (using Visual Studio Express 2010). What is the best alternative?

I am also interested in converting strings to uint64_t. Integer definitions taken from cstdint.

Answer 1

MSVC have _atoi64 and similar functions, see here

For unsigned 64 bit types, see _strtoui64

Answer 2

• use stringstreams (<sstream>)

  std::string numStr = "12344444423223";
  std::istringstream iss(numStr);
  long long num;
  iss>>num;
  

• use boost lexical_cast (boost/lexical_cast.hpp)

   std::string numStr = "12344444423223";
   long long num = boost::lexical_cast<long long>(numStr);