From 34693cd772bb891f30b584814b52fac6d4e4b4cc Mon Sep 17 00:00:00 2001
From: Stefan Weil <sw@weilnetz.de>
Date: Sat, 11 Nov 2023 15:28:05 +0100
Subject: [PATCH] Make function Network::spec pure virtual

Signed-off-by: Stefan Weil <sw@weilnetz.de>
---
 src/lstm/network.h | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/src/lstm/network.h b/src/lstm/network.h
index 0a62baf29b..feb1206f58 100644
--- a/src/lstm/network.h
+++ b/src/lstm/network.h
@@ -140,9 +140,7 @@ class TESS_API Network {
   const std::string &name() const {
     return name_;
   }
-  virtual std::string spec() const {
-    return "?";
-  }
+  virtual std::string spec() const = 0;
   bool TestFlag(NetworkFlags flag) const {
     return (network_flags_ & flag) != 0;
   }