ncludes <span class="op">=</span> <span class="st">'</span></span>
<span><span class="st">    #include "sfheaders/sf/linestring/sf_linestring.hpp"</span></span>
<span><span class="st">  '</span>,</span>
<span>  code <span class="op">=</span> <span class="st">'</span></span>
<span><span class="st">    SEXP a_linestring( SEXP x, SEXP geometry_columns, SEXP id_column ) {</span></span>
<span><span class="st">      return sfheaders::sf::sf_linestring( x, geometry_columns, id_column );</span></span>
<span><span c