How to fix C++ compilation error (error C4430: missing type specifier)?

Question

C++ / C#

An error occurs while compiling:
Error 3 error C4430: missing type specifier - int assumed. Note: C++ does not support default-int d:\04-processinfo\toolhelp.h 87 1 04 ProcessInfo
and starting from line 87 is a piece of code that most likely contains an error:

inline CToolhelp::CreateSnapshot(DWORD dwFlags, DWORD dwProcessID) {

   if (m_hSnapshot != INVALID_HANDLE_VALUE)
      CloseHandle(m_hSnapshot);

   if (dwFlags == 0) {
      m_hSnapshot = INVALID_HANDLE_VALUE;
   } else {
      m_hSnapshot = CreateToolhelp32Snapshot(dwFlags, dwProcessID);
   }
   return(m_hSnapshot != INVALID_HANDLE_VALUE);
}

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Answer 1

The return type of the CToolhelp::CreateSnapshot function is not set
By default, C substitutes int, C++ gives an error.

Answer 2

inline CToolhelp::CreateSnapshot() - implementation of the method without specifying the return type, but that's what the studio complains about.