wp_access.hpp

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#ifndef WP_ACCESS_HPP_INCLUDED
#define WP_ACCESS_HPP_INCLUDED
 
#include <memory> // std::weak_ptr, std::shared_ptr
#include <system_error>
 
#include "nonstd/expected.hpp"
 
#include "net_ip/net_ip_error.hpp"
 
namespace chops {
namespace net {
namespace detail {
 
template <typename R, typename WP, typename F>
auto wp_access(const WP& wp, F&& func) ->
      nonstd::expected<R, std::error_code> {
  if (auto sp = wp.lock()) {
    return func(sp);
  }
  return nonstd::make_unexpected(std::make_error_code(net_ip_errc::weak_ptr_expired));
}
 
template <typename WP, typename F>
auto wp_access_void(const WP& wp, F&& func) ->
      nonstd::expected<void, std::error_code> {
  if (auto sp = wp.lock()) {
    auto r = func(sp);
    if (r) {
      return nonstd::make_unexpected(r);
    }
    return { };
  }
  return nonstd::make_unexpected(std::make_error_code(net_ip_errc::weak_ptr_expired));
}
 
} // end detail namespace
} // end net namespace
} // end chops namespace
 
#endif