See Public API for a list of names and headers that are part of the public HPX API.
The HPX_PP_EXPAND macro performs a double macro-expansion on its argument.
This macro can be used to produce a delayed preprocessor expansion.
#define MACRO(a, b, c) (a)(b)(c) #define ARGS() (1, 2, 3) HPX_PP_EXPAND(MACRO ARGS()) // expands to (1)(2)(3)
X – Token to be expanded twice