r - Function param default value std:vector initialization with Rcpp and C++11? -

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I am trying to write a C + + / RCPP function in which there is an optional argument that with length 1 The value of 0 is required to be a vector. The following is not compiled properly: 

  cppFunction ("std :: vector  test (std :: vector & lt; int & gt; out = {0} } {Return;} ")   
 I get the following error:  
 
 Error in the cpp function (" std :: vector test (std :: vector) Out = {1}} {\ NBack; \ n} "): No function definitions were found besides: Warning message: 1: Filey5f629605d7.cpp No function found for RQP :: export attribute: 2 2 : SourceCpp (in code = code, <= P>   
 What is the correct way to do this?      / div> 
 
 
 currently  Rcpp  The package did not support the default value export. Ckages to repair (including  Rcpp11 ), I have a solution on  Rcpp : < / P> 
  Library ("RQP") cppFunction (Plugins = C ("CPP 11"), 'Numeric Vector Test (Study :: Vector & Lt; Int & gt; Out) {return wrap (outside); } RCPP_MODULE (mod) {function ("test", & amp; test, list :: create (_ ["out"] = std :: vector  ({0}), "simple description" );} ', Verbose = True, rebilled = True)   
 I change the type of return, thought that if you type  std :: vector & lt; Int & gt; .  
 So, how it works: it just creates a document entry with the default value, the third argument for  RCPP_MODULES .  
 crashes just  0}  my  r , therefore, I must explicitly put  std :: vector  is.

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