Integer implementation of __pow

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• Subject: Integer implementation of __pow
• From: Rici Lake <lua@...>
• Date: 2005年5月18日 14:01:55 -0500

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This code is hereby released into the public domain.
lua_Number ipow(lua_Number a, lua_Number k) {
 if (k < 0) return 0;
 else {
 lua_Number b = 1;
 for (b = k & 1 ? a : 1, k >>= 1; k; k >>= 1) {
 a *= a;
 if (k & 1) b *= a;
 }
 return b;
 }
}

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