From 50e11294cd64ec045768a6c0d415b347dc867e0f Mon Sep 17 00:00:00 2001
From: Samuel Sadok <samuel.sadok@bluewin.ch>
Date: Thu, 16 May 2019 22:11:59 +0200
Subject: [PATCH] fix compilation issue with GCC 9

---
 Firmware/fibre/cpp/include/fibre/protocol.hpp | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/Firmware/fibre/cpp/include/fibre/protocol.hpp b/Firmware/fibre/cpp/include/fibre/protocol.hpp
index 498d5172..c1f3cc68 100644
--- a/Firmware/fibre/cpp/include/fibre/protocol.hpp
+++ b/Firmware/fibre/cpp/include/fibre/protocol.hpp
@@ -976,17 +976,17 @@ public:
         output_properties_.register_endpoints(list, id + 1 + decltype(input_properties_)::endpoint_count, length);
     }
 
-    template<typename> std::enable_if_t<sizeof...(TOutputs) == 0>
+    template<size_t i = sizeof...(TOutputs)> std::enable_if_t<i == 0>
     handle_ex() {
         invoke_function_with_tuple(*obj_, func_ptr_, in_args_);
     }
 
-    template<typename> std::enable_if_t<sizeof...(TOutputs) == 1>
+    template<size_t i = sizeof...(TOutputs)> std::enable_if_t<i == 1>
     handle_ex() {
         std::get<0>(out_args_) = invoke_function_with_tuple(*obj_, func_ptr_, in_args_);
     }
     
-    template<typename> std::enable_if_t<sizeof...(TOutputs) >= 2>
+    template<size_t i = sizeof...(TOutputs)> std::enable_if_t<i >= 2>
     handle_ex() {
         out_args_ = invoke_function_with_tuple(*obj_, func_ptr_, in_args_);
     }
@@ -997,7 +997,7 @@ public:
         (void) output;
         LOG_FIBRE("tuple still at %x and of size %u\r\n", (uintptr_t)&in_args_, sizeof(in_args_));
         LOG_FIBRE("invoke function using %d and %.3f\r\n", std::get<0>(in_args_), std::get<1>(in_args_));
-        handle_ex<void>();
+        handle_ex();
     }
 
     const char * name_;