json-validator/include/jvalidate/detail/out.h

#pragma once

#include <utility>

namespace jvalidate::detail {
constexpr struct discard_out_t {
} discard_out;

template <typename T> class out {
private:
  T * ref_ = nullptr;

public:
  out() = default;
  out(discard_out_t) {}
  out(T & ref) : ref_(&ref) {}

  explicit operator bool() const { return ref_; }

  void operator=(T && val) {
    if (ref_) {
      *ref_ = std::move(val);
    }
    return *this;
  }

  void operator=(T const & val) {
    if (ref_) {
      *ref_ = val;
    }
    return *this;
  }
};
}