evalCpp: Evaluate a C++ Expression

In Rcpp: Seamless R and C++ Integration

Evaluate a C++ Expression

Description

Evaluates a C++ expression. This creates a C++ function using cppFunction and calls it to get the result.

Usage

evalCpp(code, depends = character(), plugins = character(), includes = character(), 
        rebuild = FALSE, cacheDir = getOption("rcpp.cache.dir", tempdir()),
        showOutput = verbose, verbose = getOption("verbose"))

areMacrosDefined(names, depends = character(), includes = character(), 
        rebuild = FALSE, showOutput = verbose, 
        verbose = getOption("verbose"))

Arguments

code	C++ expression to evaluate
names	names of the macros we want to test
plugins	see cppFunction
depends	see cppFunction
includes	see cppFunction
rebuild	see cppFunction
cacheDir	Directory to use for caching shared libraries. If the underlying code passed to sourceCpp has not changed since the last invocation then a cached version of the shared library is used. The default value of tempdir() results in the cache being valid only for the current R session. Pass an alternate directory to preserve the cache across R sessions.
showOutput	see cppFunction
verbose	see cppFunction

Value

The result of the evaluated C++ expression.

Note

The result type of the C++ expression must be compatible with Rcpp::wrap.

See Also

sourceCpp, cppFunction

Examples

## Not run: 

evalCpp( "__cplusplus" )
evalCpp( "std::numeric_limits<double>::max()" )
    
areMacrosDefined( c("__cplusplus", "HAS_TR1" ) )


## End(Not run)

Rcpp documentation built on Nov. 3, 2024, 1:06 a.m.