From 91a8fcbe4360bd695be47bfa65cccbcc7a3a336a Mon Sep 17 00:00:00 2001
From: Jason Volk <jason@zemos.net>
Date: Wed, 26 Apr 2023 19:18:00 -0700
Subject: [PATCH] ircd::ctx::future: Add what() exception peeking convenience
 to interface.

---
 include/ircd/ctx/future.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/include/ircd/ctx/future.h b/include/ircd/ctx/future.h
index 263a22c8b..8d031c161 100644
--- a/include/ircd/ctx/future.h
+++ b/include/ircd/ctx/future.h
@@ -46,6 +46,8 @@ struct ircd::ctx::future
 
 	bool valid() const                           { return !is(state(), future_state::INVALID);     }
 	bool operator!() const                       { return !valid();                                }
+	std::exception_ptr eptr() const              { return state().eptr;                            }
+	string_view what() const                     { return util::what(eptr());                      }
 	explicit operator T()                        { return get();                                   }
 
 	template<class U, class time_point> friend bool wait_until(const future<U> &, const time_point &, std::nothrow_t);
@@ -75,6 +77,8 @@ struct ircd::ctx::future<void>
 
 	bool valid() const                           { return !is(state(), future_state::INVALID);     }
 	bool operator!() const                       { return !valid();                                }
+	std::exception_ptr eptr() const              { return state().eptr;                            }
+	string_view what() const                     { return util::what(eptr());                      }
 
 	template<class U, class time_point> friend bool wait_until(const future<U> &, const time_point &, std::nothrow_t);
 	template<class U, class time_point> friend void wait_until(const future<U> &, const time_point &);