Added is_pre_pro, convenience routine

src/DSSP.cpp

@@ -1854,6 +1854,11 @@ float DSSP::residue_info::tco() const
 	return m_impl->mTCO;
 }
 
+bool DSSP::residue_info::is_pre_pro() const
+{
+	return m_impl->mType != kProline and m_impl->mNext != nullptr and m_impl->mNext->mType == kProline;
+}
+
 std::tuple<float, float, float> DSSP::residue_info::ca_location() const
 {
 	return { m_impl->mCAlpha.mX, m_impl->mCAlpha.mY, m_impl->mCAlpha.mZ };

src/DSSP.hpp

@@ -142,6 +142,7 @@ class DSSP
 		float tco() const;
 		float omega() const;
 
+		bool is_pre_pro() const;
 		bool is_cis() const { return omega() < 30.0f; }
 
 		std::tuple<float, float, float> ca_location() const;