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-rw-r--r--chaos/src/chaos_base.hpp2
1 files changed, 1 insertions, 1 deletions
diff --git a/chaos/src/chaos_base.hpp b/chaos/src/chaos_base.hpp
index a2072d0..3e11201 100644
--- a/chaos/src/chaos_base.hpp
+++ b/chaos/src/chaos_base.hpp
@@ -56,7 +56,7 @@ public:
data_t * m_data; // state of the system
protected:
- virtual void m_step();
+ virtual void m_step() = 0;
int m_num_eq; // number of equations of the system
};