shiva::pp
shiva::pp provides basic preprocessing utilities.
The
pp_stringify macro allows converting its parameter to a string litteral.pp_stringify(param)
const char *str = pp_stringify(hello);
//str is now "hello"
The
pp_stringviewify macro allows converting its parameter to a constexpr std::string_view.pp_stringviewify(param)
constexpr std::string_view sv = pp_stringviewify(hello);
//sv is now {"hello", 5}
The
pp_paste macro allows concatenating its parameters together to form a new token.pp_paste(param1, param2)
int var1 = 1;
pp_paste(var, 1) = 2;
//var1 is now 2
The
pp_first_arg macro allows extracting the first parameter from a variadic macro parameter list (usually represented as __VA_ARGS__).pp_first_arg(...)
int first = pp_first_arg(1, 2, 3);
//first is now 1
The
pp_count_args macro allows counting the number of parameters passed to a variadic macro.pp_count_args(...)
int nb = pp_count_args(1, 2, 3, 4, 5);
//nb is now 5
The
pp_for_each macro allows applying a given macro to each argument of a variadic macro parameter list.pp_for_each(apply, ...)
#define doubleParam(a) (a * 2),
std::vector<int> v{pp_for_each(doubleParam, 1, 2, 3)};
//v is now {2, 4, 6}
#define incrementIBy(nb) i += nb;
int i = 0;
pp_for_each(incrementIBy, 1, 2, 3);
//i is now 6
Last modified 5yr ago