Made getCollectiveVariableValues() const (#3599)

openmmapi/include/openmm/CustomCVForce.h

@@ -238,7 +238,7 @@ public:
      * @param[out] values    the values of the collective variables are computed and
      *                       stored into this
      */
-    void getCollectiveVariableValues(Context& context, std::vector<double>& values);
+    void getCollectiveVariableValues(Context& context, std::vector<double>& values) const;
     /**
      * Get the inner Context used for evaluating collective variables.
      * 

openmmapi/include/openmm/Force.h

@@ -108,7 +108,7 @@ protected:
     /**
      * Get the ForceImpl corresponding to this Force in a Context.
      */
-    ForceImpl& getImplInContext(Context& context);
+    ForceImpl& getImplInContext(Context& context) const;
     /**
      * Get a const reference to the ForceImpl corresponding to this Force in a Context.
      */
@@ -116,7 +116,7 @@ protected:
     /**
      * Get the ContextImpl corresponding to a Context.
      */
-    ContextImpl& getContextImpl(Context& context);
+    ContextImpl& getContextImpl(Context& context) const;
 private:
     int forceGroup;
     std::string name;

openmmapi/include/openmm/internal/ForceImpl.h

@@ -116,7 +116,7 @@ protected:
     /**
      * Get the ContextImpl corresponding to a Context.
      */
-    ContextImpl& getContextImpl(Context& context) {
+    ContextImpl& getContextImpl(Context& context) const {
         return context.getImpl();
     }
 };

openmmapi/src/CustomCVForce.cpp

@@ -140,7 +140,7 @@ const string& CustomCVForce::getTabulatedFunctionName(int index) const {
     return functions[index].name;
 }
 
-void CustomCVForce::getCollectiveVariableValues(Context& context, vector<double>& values) {
+void CustomCVForce::getCollectiveVariableValues(Context& context, vector<double>& values) const {
     dynamic_cast<CustomCVForceImpl&>(getImplInContext(context)).getCollectiveVariableValues(getContextImpl(context), values);
 }
 

openmmapi/src/Force.cpp

@@ -76,7 +76,7 @@ bool Force::usesPeriodicBoundaryConditions() const {
     throw OpenMMException("usesPeriodicBoundaryConditions is not implemented");
 }
 
-ForceImpl& Force::getImplInContext(Context& context) {
+ForceImpl& Force::getImplInContext(Context& context) const {
     for (auto impl : context.getImpl().getForceImpls())
         if (&impl->getOwner() == this)
             return *impl;
@@ -90,6 +90,6 @@ const ForceImpl& Force::getImplInContext(const Context& context) const {
     throw OpenMMException("getImplInContext: This Force is not present in the Context");
 }
 
-ContextImpl& Force::getContextImpl(Context& context) {
+ContextImpl& Force::getContextImpl(Context& context) const {
     return context.getImpl();
 }