Rcpp::depends attribute is added to a C++ source file to indicate that it has a compilation dependency on one or more other packages. For example:
Packages which the source file depends on for compilation
Rcpp::depends attribute is used by the implementation of the
sourceCpp function to correctly setup the build environment for
R CMD SHLIB.
The include directories of the specified packages are added to the
CLINK_CPPFLAGS environment variable. In addition, if the referenced package provides an inline plugin it is called to determine additional environment variables required to successfully build.
Rcpp::depends attribute is specified using a syntax compatible with the new generalized attributes feature of the C++11 standard. Note however that since this feature is not yet broadly supported by compilers it needs to be specified within a comment (see examples below).
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