Building with CMake and Eigen

[jfowkes]

Can I just clarify what the correct way to build with CMake and Eigen is? I'm currently using:

# Find python and pybind11
find_package(Python COMPONENTS Interpreter Development REQUIRED)
find_package(pybind11 CONFIG REQUIRED)

# Find Eigen 3.4+
find_package(Eigen3 3.4 REQUIRED)
include_directories(${EIGEN3_INCLUDE_DIR})

# Add project sources to python module
file(GLOB SOURCES src/*.cpp)
pybind11_add_module(example ${SOURCES})

It would be good if this was documented in the Building with CMake section of the docs since Eigen is the natural way to use numpy arrays with pybind11 on the C++ side.