I would like to implement the following logic, I'm not sure if it is possible:
#include <stddef.h>
#include <array>
template<size_t SIZE>
constexpr std::array<const char*, 1> fun(const char (&name)[SIZE])
{
return {name};
}
template<size_t SIZE_1, size_t SIZE_2>
constexpr std::array<const char*, 2> fun(const char (&name1)[SIZE_1], const char (&name2)[SIZE_2])
{
return {name1, name2};
}
// I would like to do something like this:
template<size_t... SIZES>
constexpr std::array<const char*, sizeof...(SIZES)> fun(const char (&/*???*/)[SIZES]/*...*/)
{
//???
}
int main()
{
static constexpr auto fun1 = fun("aaa");
static constexpr auto fun2 = fun("aaa", "bbb");
//static constexpr auto funN = fun("aaa", "bbb", "ccc");
}
It is important to get the parameters as raw arrays to do additional compile time magic on them.
CodePudding user response:
Knowing where to put the ...
is much simpler with a type alias
template<std::size_t N>
using chars = const char (&)[N];
template<std::size_t... SIZES>
constexpr std::array<const char*, sizeof...(SIZES)> fun(chars<SIZES>... names)
{
return { names... };
}
See it on coliru