Optimize function in Rcpp

I am trying to find the counterpart of R's optimize function in C++ when using Rcpp. Any suggestions?

I read ?optimize and found the url to the c code

http://www.netlib.org/fmm/fmin.f

I guess it depends on what you mean by counterpart. What I provided is literally the r function as a c implementation

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thanks for the reply. I am looking for something from existing packages like Eigen, Boost, etc.