Is there a string literal prefix for kernel strings stored in host code

I have a memory of seeing an example of creating an OpenCL kernel where it was stored as a const char* in the host code with an OCL prefix before the string containing the kernel. Yet no matter what I search for I can’t seem to find the example again. So I have to ask, does a string literal prefix like this exist or am I going crazy?

Update: I found the page I was remembering. It was the opencl c++ bindings page and the prefix was R"CLC()CLC