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Classes and Functions

The C++ interface have the same functions as the Lua interface except for the following changes.

• An instance of a class is initiated to smart pointers. For example to instantiate a SimulationPlanar object, the right way to do is

Ptr<SimulationPlanar> s = SimulationPlanar::instanceNew();

This also applies to the instantiation of SimulationGrating and SimulationPattern objects. The advantage of using smart pointers is that there is no need to do manual gabage collection using delete.

• Function names: the function names starts with lower case whereas Lua interface starts with a capital letter.

• extra inputs in function setMaterial. In C++, this function is called as

void setMaterial(const std::string name, double** epsilon, const std::string type)

where type is one of "scalar", "diagonal" and "tensor". The 2D array epsilon then depends on the type. For scalar, the epsilon is of dimension $\text{# omega}\times 2$. For diagonal, the epsilon is of dimension $\text{# omega}\times 6$, and for tensor, the epsilon is of dimension $\text{# omega}\times 10$.

• changes in obtaining physical constants. In C++ there is no need to initiate or call any function to retrieve the constants. A constant, for example $q$, can be directly obtained by using constant.q.

• Extra Makefile is needed. An example for the Makefile for a main.cpp file is

CFLAGS=-std=c++11 -O3 -ffast-math -march=native -fopenmp  
MESHPATH=../../          
INCLUDES=-I$(MESHPATH)/src        
ARMAINCLUDE=-I$(MESHPATH)/src/arma -DARMA_DONT_USE_WRAPPER -DARMA_NO_DEBUG         
LIBS=-L$(MESHPATH)/build -lmesh -lopenblas -llapack        
CXX=g++       
all:     
 $(CXX) $(CFLAGS) $(INCLUDES) ${ARMAINCLUDE} main.cpp -o main $(LIBS)

The MESHPATH should point to where the src folder is placed.