[Rd] Standalone Mathlib, C++ and ISNAN()
tlumley at u.washington.edu
Sat Jan 8 23:11:57 CET 2005
The C++ math header undefines isnan, so if isnan is a macro, ISNAN() will
not work in C++ code.
C99 specifies that isnan is a macro, but in C90 compilers, where it is an
extension, isnan is often a function (explaining why the issue didn't come
up earlier). For example, isnan is a macro on my Mac laptop but a function
on my Linux desktop.
R-devel now defines ISNAN to call a function if used in C++ code. It still
calls isnan in C code.
Thomas Lumley Assoc. Professor, Biostatistics
tlumley at u.washington.edu University of Washington, Seattle
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