external/bsd/kyua-cli/dist/utils/noncopyable.hpp

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  28
  29 /// \file utils/noncopyable.hpp
  30 /// Provides the utils::noncopyable class.
  31 ///
  32 /// The class is provided as a separate module on its own to minimize
  33 /// header-inclusion side-effects.
  34
  35 #if !defined(UTILS_NONCOPYABLE_HPP)
  36 #define UTILS_NONCOPYABLE_HPP
  37
  38
  39 namespace utils {
  40
  41
  42 /// Forbids copying a class at compile-time.
  43 ///
  44 /// Inheriting from this class delivers a private copy constructor and an
  45 /// assignment operator that effectively forbid copying the class during
  46 /// compilation.
  47 ///
  48 /// Always use private inheritance.
  49 class noncopyable {
  50     /// Data placeholder.
  51     ///
  52     /// The class cannot be empty; otherwise we get ABI-stability warnings
  53     /// during the build, which will break it due to strict checking.
  54     int _noncopyable_dummy;
  55
  56     /// Private copy constructor to deny copying of subclasses.
  57     noncopyable(const noncopyable&);
  58
  59     /// Private assignment constructor to deny copying of subclasses.
  60     noncopyable& operator=(const noncopyable&);
  61
  62 protected:
  63     // Explicitly needed to provide some non-private functions.  Otherwise
  64     // we also get some warnings during the build.
  65     noncopyable(void) {}
  66     ~noncopyable(void) {}
  67 };
  68
  69
  70 }  // namespace utils
  71
  72
  73 #endif  // !defined(UTILS_NONCOPYABLE_HPP)