in include/poac/core/inference.hpp [164:174]
static auto branch(S&& s, Index idx, VS&& vs) -> decltype(summary(Indices(), static_cast<int>(idx))) {
namespace exception = core::exception;
if (s == "exec")
return execute(Indices(), static_cast<int>(idx), std::move(vs));
else if (s == "summary")
return summary(Indices(), static_cast<int>(idx));
else if (s == "options")
return options(Indices(), static_cast<int>(idx));
else
throw exception::invalid_first_arg("Invalid argument");
}