opaque_handle/src/main.cpp

#include <cstdio>
#include <unistd.h>

#include "../include/opaque.hh"


static void print_view(std::string_view ptr)
{
	//std::string_view ptr{string};

	size_t sz;
#if DIRECT_WRITE
	if(__builtin_expect((sz = ptr.size()) > 0, true)) {
		write(1, "> ", 2);
		write(1, ptr.data(), sz);
	} else	write(1, "! <null>\n", 8);
	write(1, "\n", 1);
#else
	if(__builtin_expect((sz = ptr.size()) > 0, true)) {
		printf("> %.*s\n", (int)sz, ptr.data());
	} else puts("! <null>\n");
#endif
}
static inline void print(const std::string& string)
{
	std::string_view sv{string};
	return print_view(sv);
}

void use_moh()
{
	std::string str{"Hello from 2!"};
	constexpr auto _h = [](std::string* ptr, auto op) noexcept {
		if(ptr) {
			switch(op) {
				case opaque_handle_operation::Clone: return new std::string(*ptr);
				case opaque_handle_operation::Delete: delete ptr; break;
			}
		}
		return static_cast<std::string*>(nullptr);
	};
	opaque_handle v{make_opaque_handle<std::string, _h>(&str)};
	print(*v);
}

int main()
{
	const opaque_handle v{make_opaque_object_handle(std::string{"Hello world"})};
	print(*v); //XXX: Why does converting it to string_view here break it?
	use_moh();
	return 0;
}