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/// \file utils/noncopyable.hpp

/// Provides the utils::noncopyable class.

///

/// The class is provided as a separate module on its own to minimize

/// header-inclusion side-effects.

#if !defined(UTILS_NONCOPYABLE_HPP)

#define UTILS_NONCOPYABLE_HPP

namespace utils {

/// Forbids copying a class at compile-time.

///

/// Inheriting from this class delivers a private copy constructor and an

/// assignment operator that effectively forbid copying the class during

/// compilation.

///

/// Always use private inheritance.

class noncopyable {

    /// Data placeholder.

    ///

    /// The class cannot be empty; otherwise we get ABI-stability warnings

    /// during the build, which will break it due to strict checking.

    int _noncopyable_dummy;

    /// Private copy constructor to deny copying of subclasses.

    noncopyable(const noncopyable&);

    /// Private assignment constructor to deny copying of subclasses.

    noncopyable& operator=(const noncopyable&);

protected:

    // Explicitly needed to provide some non-private functions.  Otherwise

    // we also get some warnings during the build.

    noncopyable(void) {}

    ~noncopyable(void) {}

};

}  // namespace utils

#endif  // !defined(UTILS_NONCOPYABLE_HPP)