Do C++ STL functions work in S-function code?

I tried to print to stdout using std::cout << myMessage << std::endl, but the message does not appear, either in the console or the terminal from which I launched MATLAB, whereas printf works as expected. Why does std::cout not work?

Background:

• I created a minimal model, threeModel.slx, containing an S-Function block, in local directory working.
• I copied matlab/2016b/toolbox/simulink/simdemos/simfeatures/src/timestwo.c as working/three.cpp.
• I #include d iostream and cstdio into three.cpp .
• I inserted the following code into three.cpp at the end of function mdlOutputs: std::cout << "Testing cout." << std::endl; printf("Testing printf."):
• I compiled with MEX: >> mex three.cpp (Built normally.)
• I set the S-Function block's S-Function name parameter to three and left the other parameters with default settings (empty).

When I ran simulation (^T), I saw "Testing printf" (repeatedly) in the console window from which I had launched MATLAB, but no "Testing cout." Why not? Thanks!

Answer 1

[Amittai Aviram]

I have discovered that output to std::cout gets routed to the Diagnostic Viewer: if I click on "View diagnostics" at the bottom of the model window, I can see it. Now my question is how to route the output elsewhere, e.g., to the MATLAB console.