vector_dc

numeric_dc

integer_dc

<code>vector_dc</code> and its shortcuts <code>numeric_dc</code> and
<code>integer_dc</code> are helper functions used in calls to <code>.C64</code>.
They return an R object of class <code>c("vector_dc", "list")</code>, 
which contains information on the type and length of the vector to allocate.
Using <code>vector_dc</code> together with <code>INTENT = "w"</code> argument of <code>.C64</code>
leads to performance gains by avoiding unnecessary castings and copies.

Provides .C64(), which is an enhanced version of .C()
and .Fortran() from the foreign function interface. .C64() supports long
vectors, arguments of type 64-bit integer, and provides a mechanism to
avoid unnecessary copies of read-only and write-only arguments. This
makes it a convenient and fast interface to C/C++ and Fortran code.

Reinhard Furrer

dotCall64

Enhanced Foreign Function Interface Supporting Long Vectors

Kaspar Moesinger

Florian Gerber

vector_dc function

<dl><dt>mode</dt>
<dd>character vector of length 1. Storage mode of the vector.</dd>
<dt>length</dt>
<dd>numeric vector of length 1. Length of the vector.</dd></dl>

Arguments

Allocate vectors in .C64() — vector_dc

<dl>

<dt>mode</dt>
<dd>character vector of length 1. Storage mode of the vector.</dd>


<dt>length</dt>
<dd>numeric vector of length 1. Length of the vector.</dd>

</dl>

vector_dc: Allocate vectors in .C64()

Description

Usage

Value

Arguments

Examples