Templated hash

hash.cpp

#include <cstdint>
#include <cstdio>

#define INLINE __forceinline

template <typename HashFunction>
class StringHash
{
public:
	template <std::size_t N>
	INLINE StringHash(const char (&value)[N])
	: _hash(HashFunction::hash<N>(value))
	{ }

	INLINE std::uint32_t getHash() { return _hash; }

private:
	std::uint32_t _hash;
} ;

struct HashFNV1a
{
	template <std::size_t N>
	INLINE static std::uint32_t hash(const char (&value)[N])
	{
		return (hash<N-1>((const char(&)[N-1])value)^ value[N-1]) * 16777619u;
	}

	template <>
	INLINE static std::uint32_t hash<1>(const char (&value)[1])
	{
		return (2166136261u^ value[0]) * 16777619u;
	}
} ;

int main()
{
	typedef StringHash<HashFNV1a> StringHashFNV1a;

	printf("Hash test: %d", StringHashFNV1a("").getHash());
	/*
	push	84696351				; 050c5d1fH
	push	OFFSET ??_C@_0O@HFJMNHFL@Hash?5test?3?5?$CFd?$AA@
	call	esi
	*/

	printf("Hash test: %d", StringHashFNV1a("test").getHash());
	/*
	push	-1440527489				; aa234b7fH
	push	OFFSET ??_C@_0O@HFJMNHFL@Hash?5test?3?5?$CFd?$AA@
	call	esi
	*/

	printf("Hash test: %d", StringHashFNV1a("aLongerTest").getHash());
	/*
	push	1145903687				; 444d1a47H
	push	OFFSET ??_C@_0O@HFJMNHFL@Hash?5test?3?5?$CFd?$AA@
	call	esi
	*/

	printf("Hash test: %d", StringHashFNV1a("aVeryLongTestWhichStillWorks").getHash());
	/*
	push	1839041337				; 6d9d8b39H
	push	OFFSET ??_C@_0O@HFJMNHFL@Hash?5test?3?5?$CFd?$AA@
	call	esi
	*/
}