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Query FailedJosh -yosh64
Saturday, May 22, 2010

Reavenk has beat me to it, I was actually up very late into the morning last night (I'm from Australia) when I logged onto Google and to my surprise there was Pacman. Played a few games and was quite fun, was actually wondering what it was all about and now I know

Reavenk
Saturday, May 22, 2010

Agh! I can't beleive you didn't make a reference to Google's doodle of the day. It's a pacman level that spells Google, that you can actually play! It's got cutscenes and everything.

rebb
Friday, May 21, 2010

Your other project was growing an extra set of hands ?

Well done !

Oh wait.. Congrats

Aslan Dzodzikov
Monday, May 17, 2010

Just a test result for StringHash:

void PrintHash(const StringHash& _hash)
{
printf( "%x", (unsigned)_hash );
}

PrintHash("Creating Device! Just a test for StringHash"

;

compiles to:
lea eax, DWORD PTR $T107665[esp+684]
push edi
push eax
mov DWORD PTR $T107665[esp+692], 1584422291 ; 5e705d93H
call ?PrintHash@@YAXABVStringHash@@@Z ; PrintHash
add esp, 4

Under MSVC 2008 SP1

Aslan Dzodzikov
Friday, May 14, 2010

And now the final, more compact version:

class StringHash
{
unsigned m_val;

template<size_t N> unsigned _Hash(const char (&str)[N])
{
typedef const char (&truncated_str)[N-1];
return str[N-1] + 65599 * _Hash((truncated_str)str);
}
unsigned _Hash(const char (&str)[2]) { return str[1] + 65599 * str[0]; }

public:
template <size_t N> StringHash(const char (&str)[N]) { m_val = _Hash(str); }
operator unsigned() { return m_val; }
};

I apologize for multiple, redundant posts.

Aslan Dzodzikov
Friday, May 14, 2010

Sorry, the previous post contained 1 bug. Here is corrected code:

namespace StringHashHelper
{
template<size_t N>
inline unsigned _Hash(const char (&str)[N])
{
typedef const char (&truncated_str)[N-1];
return str[N-1] + 65599 * _Hash<N-1>((truncated_str)str);
}

template<>
inline unsigned _Hash<1>(const char (&str)[1])
{
return str[0];
}
};

class StringHash
{
unsigned m_val;

public:
template <size_t N>
StringHash(const char (&str)[N])
{
m_val = StringHashHelper::_Hash(str);
}

operator unsigned() { return m_val; }
};

StringHash a = "a", ab = "ab";

Aslan Dzodzikov
Friday, May 14, 2010

It is possible to create just one templated constructor:

namespace StringHashHelper
{
template<size_t N>
unsigned _Hash(const char (&str)[N])
{
typedef const char (&truncated_str)[N-1];
return str[N] + 65599 * _Hash<N-1>((truncated_str)str);
}

template<>
unsigned _Hash<1>(const char (&str)[1])
{
return str[0];
}
};

class StringHash
{
unsigned m_val;

public:
template <size_t N>
StringHash(const char (&str)[N])
{
m_val = StringHashHelper::_Hash(str);
}

operator unsigned() { return m_val; }
};

StringHash a = "a", ab = "ab";

This implementation guaranties loop unrolling.

Aslan Dzodzikov
Friday, May 14, 2010

I have noticed similar inefficiency in MSVC 2008 SP1 - it doesn't eliminate dead code in very obvious case of auto_ptr copy.


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