/usr/include/primesieve/Callback.hpp is in libprimesieve6-dev-common 5.6.0+ds-1.
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/// @file Callback.hpp
/// @brief Callback interface classes.
///
/// Copyright (C) 2015 Kim Walisch, <kim.walisch@gmail.com>
///
/// This file is distributed under the BSD License. See the COPYING
/// file in the top level directory.
///
#ifndef CALLBACK_PRIMESIEVE_HPP
#define CALLBACK_PRIMESIEVE_HPP
#include <stdint.h>
namespace primesieve {
/// callback interface class. Objects derived from this class can be
/// passed to the primesieve::generate_primes() functions.
/// @param T must be uint64_t.
///
template <typename T>
class Callback
{
public:
virtual void callback(T prime) = 0;
virtual ~Callback() { }
};
} // namespace primesieve
#endif
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