Fix typo, and disallow 0-sized EquationSystems.

1 files changed, 6 insertions, 2 deletions

diff --git a/src/vZ/EquationSystem.hpp b/src/vZ/EquationSystem.hpp
index 6409f18..790676c 100644
--- a/src/vZ/EquationSystem.hpp
+++ b/src/vZ/EquationSystem.hpp
@@ -37,8 +37,8 @@ namespace vZ
     // EquationSystem();
     // ~EquationSystem();
 
-    T&       operator[](std::size_t i)       { return m_values[0]; }
-    const T& operator[](std::size_t i) const { return m_values[0]; }
+    T&       operator[](std::size_t i)       { return m_values[i]; }
+    const T& operator[](std::size_t i) const { return m_values[i]; }
 
     EquationSystem& operator+=(const EquationSystem& rhs);
     EquationSystem& operator-=(const EquationSystem& rhs);
@@ -49,6 +49,10 @@ namespace vZ
     T m_values[N];
   };
 
+  // Disallow 0-sized EquationSystems
+  template <typename T>
+  class EquationSystem<0, T>;
+
   // Traits specialization
   template <std::size_t N, typename T>
   class Traits<EquationSystem<N, T> >