initial commit

.gitignore

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+test/test

Makefile

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+
+
+.PHONY: test
+test: test/test
+
+test/test: test/test.cpp
+	$(CXX) -I. --std=c++20 $< -o $@
+	if strings $@ | grep Hello; then exit 1; fi
+	strings $@ | grep bOFFE >> /dev/null
+	@echo "Passed."
+
+clean:
+	rm -f test/test

cfrob.hpp

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+#pragma once
+
+namespace frob
+{
+	using u8 = unsigned char;
+	constexpr u8 rot13(u8 i)
+	{
+		return i ^ (u8)42;
+	}
+
+	template<std::size_t N>
+	struct cfrob
+	{
+		char out[N]{};
+		constexpr cfrob(const char (&sz)[N])
+		{
+			for(std::size_t i=0;i<N-1;i++)
+				out[i] = rot13((u8)sz[i]);
+			out[N-1] = 0;
+		}
+	};
+	template<>
+	struct cfrob<0>
+	{
+		char out[0]{};
+	};
+}
+
+template<frob::cfrob C>
+constexpr auto operator "" _frob()
+{
+	return C.out;
+}
+

test/test.cpp

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+#include <iostream>
+#include <cstring>
+
+#include <cfrob.hpp>
+
+const auto str = "Hello world."_frob;
+
+int main()
+{
+	char* str2 = strdup(str);
+	memfrob(str2, strlen(str));
+
+	std::cout << str << std::endl;
+	std::cout << str2 << std::endl;	
+	free(str2);
+
+	return 0;
+}