From e81df263f4123a39fe6d4d50fb21f47dd242e796 Mon Sep 17 00:00:00 2001
From: Stanislaw Halik <sthalik@misaki.pl>
Date: Thu, 20 Dec 2018 18:23:14 +0100
Subject: remove const correctness violations

This is possibly related to a livelock where several threads do const
removal in their respective code paths.

Use the `mutable' specifier for the mutexes and spline's cached data.

Now using the `mutable' specifier, get rid of <optional> in
compat/mutex.
---
 tracker-pt/pt-api.hpp | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

(limited to 'tracker-pt')

diff --git a/tracker-pt/pt-api.hpp b/tracker-pt/pt-api.hpp
index 12085560..6c36ebaf 100644
--- a/tracker-pt/pt-api.hpp
+++ b/tracker-pt/pt-api.hpp
@@ -42,16 +42,13 @@ struct pt_frame : pt_pixel_pos_mixin
     template<typename t>
     t* as() &
     {
-        using u = remove_cvref_t<t>;
-        static_assert(std::is_convertible_v<u*, pt_frame*>, "must be derived from pt_frame");
-
         return static_cast<t*>(this);
     }
 
     template<typename t>
     t const* as_const() const&
     {
-        return const_cast<pt_frame*>(this)->as<const t>();
+        return static_cast<t const*>(this);
     }
 };
 
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