[Rcpp-devel] Delayed usage of auxiliary memory in RcppArmadillo
szehnder at uni-bonn.de
Mon Jun 10 23:07:18 CEST 2013
Dear Rcpp::Devels and Rcpp::Users,
I am temporarily experiencing with a delayed assignment of auxiliary memory in RcppArmadillo:
Declare a matrix from which you know you may need it
(In C++ a declaration makes only known the type and name but allocates no storage yet).
Now you check a condition and if it is true, you will need the matrix, so you initialize it
maybeM = arma::mat(aux_mem*, n_rows, n_cols, copy_aux_mem = false, strict = true)
(for simplicity I only printed here the default constructor for using auxiliary memory; please assume that all values are presented)
The resulting matrix maybeM does not use the auxiliary memory. I tried to access in some way the 'mem' member in the Armadillo class, but this member is constant and can not be
manipulated after first construction. A primer declaration and later initialization is a very common pattern in C++, but it seems not be possible in case of reusing memory.
I conclude, that a delayed assignment of auxiliary memory is not possible.
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