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< div class = "title" > thorough_hash.h< / div > < / div >
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< a href = "thorough__hash_8h.html" > Go to the documentation of this file.< / a > < div class = "fragment" > < div class = "line" > < a name = "l00001" > < / a > < span class = "lineno" > 1< / span >   < span class = "comment" > // Copyright 2010-2018 Google LLC< / span > < / div >
< div class = "line" > < a name = "l00002" > < / a > < span class = "lineno" > 2< / span >   < span class = "comment" > // Licensed under the Apache License, Version 2.0 (the " License" );< / span > < / div >
< div class = "line" > < a name = "l00003" > < / a > < span class = "lineno" > 3< / span >   < span class = "comment" > // you may not use this file except in compliance with the License.< / span > < / div >
< div class = "line" > < a name = "l00004" > < / a > < span class = "lineno" > 4< / span >   < span class = "comment" > // You may obtain a copy of the License at< / span > < / div >
< div class = "line" > < a name = "l00005" > < / a > < span class = "lineno" > 5< / span >   < span class = "comment" > //< / span > < / div >
< div class = "line" > < a name = "l00006" > < / a > < span class = "lineno" > 6< / span >   < span class = "comment" > // http://www.apache.org/licenses/LICENSE-2.0< / span > < / div >
< div class = "line" > < a name = "l00007" > < / a > < span class = "lineno" > 7< / span >   < span class = "comment" > //< / span > < / div >
< div class = "line" > < a name = "l00008" > < / a > < span class = "lineno" > 8< / span >   < span class = "comment" > // Unless required by applicable law or agreed to in writing, software< / span > < / div >
< div class = "line" > < a name = "l00009" > < / a > < span class = "lineno" > 9< / span >   < span class = "comment" > // distributed under the License is distributed on an " AS IS" BASIS,< / span > < / div >
< div class = "line" > < a name = "l00010" > < / a > < span class = "lineno" > 10< / span >   < span class = "comment" > // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.< / span > < / div >
< div class = "line" > < a name = "l00011" > < / a > < span class = "lineno" > 11< / span >   < span class = "comment" > // See the License for the specific language governing permissions and< / span > < / div >
< div class = "line" > < a name = "l00012" > < / a > < span class = "lineno" > 12< / span >   < span class = "comment" > // limitations under the License.< / span > < / div >
< div class = "line" > < a name = "l00013" > < / a > < span class = "lineno" > 13< / span >   < / div >
< div class = "line" > < a name = "l00014" > < / a > < span class = "lineno" > 14< / span >   < span class = "preprocessor" > #ifndef OR_TOOLS_BASE_THOROUGH_HASH_H_< / span > < / div >
< div class = "line" > < a name = "l00015" > < / a > < span class = "lineno" > 15< / span >   < span class = "preprocessor" > #define OR_TOOLS_BASE_THOROUGH_HASH_H_< / span > < / div >
< div class = "line" > < a name = "l00016" > < / a > < span class = "lineno" > 16< / span >   < / div >
< div class = "line" > < a name = "l00017" > < / a > < span class = "lineno" > 17< / span >   < span class = "preprocessor" > #include " < a class = "code" href = "integral__types_8h.html" > ortools/base/integral_types.h< / a > " < / span > < / div >
< div class = "line" > < a name = "l00018" > < / a > < span class = "lineno" > 18< / span >   < / div >
< div class = "line" > < a name = "l00019" > < / a > < span class = "lineno" > 19< / span >   < span class = "keyword" > namespace < / span > < a class = "code" href = "namespaceoperations__research.html" > operations_research< / a > {< / div >
< div class = "line" > < a name = "l00020" > < / a > < span class = "lineno" > < a class = "line" href = "namespaceoperations__research.html#a6748db3fd54f3ca8e43f0c52b8efc938" > 20< / a > < / span >   < span class = "keyword" > inline< / span > < a class = "code" href = "integral__types_8h.html#abc0f5bc07737e498f287334775dff2b6" > uint64< / a > < a class = "code" href = "namespaceoperations__research.html#a6748db3fd54f3ca8e43f0c52b8efc938" > MixTwoUInt64< / a > (< a class = "code" href = "integral__types_8h.html#abc0f5bc07737e498f287334775dff2b6" > uint64< / a > fp1, < a class = "code" href = "integral__types_8h.html#abc0f5bc07737e498f287334775dff2b6" > uint64< / a > fp2) {< / div >
< div class = "line" > < a name = "l00021" > < / a > < span class = "lineno" > 21< / span >   < span class = "comment" > // Two big prime numbers.< / span > < / div >
< div class = "line" > < a name = "l00022" > < / a > < span class = "lineno" > 22< / span >   < span class = "keyword" > const< / span > < a class = "code" href = "integral__types_8h.html#abc0f5bc07737e498f287334775dff2b6" > uint64< / a > kMul1 = 0xc6a4a7935bd1e995ULL;< / div >
< div class = "line" > < a name = "l00023" > < / a > < span class = "lineno" > 23< / span >   < span class = "keyword" > const< / span > < a class = "code" href = "integral__types_8h.html#abc0f5bc07737e498f287334775dff2b6" > uint64< / a > kMul2 = 0x228876a7198b743ULL;< / div >
< div class = "line" > < a name = "l00024" > < / a > < span class = "lineno" > 24< / span >   < a class = "code" href = "integral__types_8h.html#abc0f5bc07737e498f287334775dff2b6" > uint64< / a > < a class = "code" href = "constraint__solver_2table_8cc.html#af730895c6c6ef6e03caaf6251192dfd2" > a< / a > = fp1 * kMul1 + fp2 * kMul2;< / div >
< div class = "line" > < a name = "l00025" > < / a > < span class = "lineno" > 25< / span >   < span class = "comment" > // Note: The following line also makes sure we never return 0 or 1, because we< / span > < / div >
< div class = "line" > < a name = "l00026" > < / a > < span class = "lineno" > 26< / span >   < span class = "comment" > // will only add something to ' a' if there are any MSBs (the remaining bits< / span > < / div >
< div class = "line" > < a name = "l00027" > < / a > < span class = "lineno" > 27< / span >   < span class = "comment" > // after the shift) being 0, in which case wrapping around would not happen.< / span > < / div >
< div class = "line" > < a name = "l00028" > < / a > < span class = "lineno" > 28< / span >   < span class = "keywordflow" > return< / span > < a class = "code" href = "constraint__solver_2table_8cc.html#af730895c6c6ef6e03caaf6251192dfd2" > a< / a > + (~< a class = "code" href = "constraint__solver_2table_8cc.html#af730895c6c6ef6e03caaf6251192dfd2" > a< / a > > > 47);< / div >
< div class = "line" > < a name = "l00029" > < / a > < span class = "lineno" > 29< / span >   }< / div >
< div class = "line" > < a name = "l00030" > < / a > < span class = "lineno" > 30< / span >   < / div >
< div class = "line" > < a name = "l00031" > < / a > < span class = "lineno" > 31< / span >   < span class = "comment" > // This should be better (collision-wise) than the default hash< string> , without< / span > < / div >
< div class = "line" > < a name = "l00032" > < / a > < span class = "lineno" > 32< / span >   < span class = "comment" > // being much slower. It never returns 0 or 1.< / span > < / div >
< div class = "line" > < a name = "l00033" > < / a > < span class = "lineno" > < a class = "line" href = "namespaceoperations__research.html#a8627f242a0332f34d29d85b6c57f1224" > 33< / a > < / span >   < span class = "keyword" > inline< / span > < a class = "code" href = "integral__types_8h.html#abc0f5bc07737e498f287334775dff2b6" > uint64< / a > < a class = "code" href = "namespaceoperations__research.html#a8627f242a0332f34d29d85b6c57f1224" > ThoroughHash< / a > (< span class = "keyword" > const< / span > < span class = "keywordtype" > char< / span > * bytes, < span class = "keywordtype" > size_t< / span > len) {< / div >
< div class = "line" > < a name = "l00034" > < / a > < span class = "lineno" > 34< / span >   < span class = "comment" > // Some big prime numer.< / span > < / div >
< div class = "line" > < a name = "l00035" > < / a > < span class = "lineno" > 35< / span >   < a class = "code" href = "integral__types_8h.html#abc0f5bc07737e498f287334775dff2b6" > uint64< / a > fp = 0xa5b85c5e198ed849ULL;< / div >
< div class = "line" > < a name = "l00036" > < / a > < span class = "lineno" > 36< / span >   < span class = "keyword" > const< / span > < span class = "keywordtype" > char< / span > * end = bytes + len;< / div >
< div class = "line" > < a name = "l00037" > < / a > < span class = "lineno" > 37< / span >   < span class = "keywordflow" > while< / span > (bytes + 8 < = end) {< / div >
< div class = "line" > < a name = "l00038" > < / a > < span class = "lineno" > 38< / span >   fp = < a class = "code" href = "namespaceoperations__research.html#a6748db3fd54f3ca8e43f0c52b8efc938" > MixTwoUInt64< / a > (fp, *(< span class = "keyword" > reinterpret_cast< < / span > < span class = "keyword" > const < / span > < a class = "code" href = "integral__types_8h.html#abc0f5bc07737e498f287334775dff2b6" > uint64< / a > *< span class = "keyword" > > < / span > (bytes)));< / div >
< div class = "line" > < a name = "l00039" > < / a > < span class = "lineno" > 39< / span >   bytes += 8;< / div >
< div class = "line" > < a name = "l00040" > < / a > < span class = "lineno" > 40< / span >   }< / div >
< div class = "line" > < a name = "l00041" > < / a > < span class = "lineno" > 41< / span >   < span class = "comment" > // Note: we don' t care about " consistency" (little or big endian) between< / span > < / div >
< div class = "line" > < a name = "l00042" > < / a > < span class = "lineno" > 42< / span >   < span class = "comment" > // the bulk and the suffix of the message.< / span > < / div >
< div class = "line" > < a name = "l00043" > < / a > < span class = "lineno" > 43< / span >   < a class = "code" href = "integral__types_8h.html#abc0f5bc07737e498f287334775dff2b6" > uint64< / a > last_bytes = 0;< / div >
< div class = "line" > < a name = "l00044" > < / a > < span class = "lineno" > 44< / span >   < span class = "keywordflow" > while< / span > (bytes < end) {< / div >
< div class = "line" > < a name = "l00045" > < / a > < span class = "lineno" > 45< / span >   last_bytes += *bytes;< / div >
< div class = "line" > < a name = "l00046" > < / a > < span class = "lineno" > 46< / span >   last_bytes < < = 8;< / div >
< div class = "line" > < a name = "l00047" > < / a > < span class = "lineno" > 47< / span >   bytes++;< / div >
< div class = "line" > < a name = "l00048" > < / a > < span class = "lineno" > 48< / span >   }< / div >
< div class = "line" > < a name = "l00049" > < / a > < span class = "lineno" > 49< / span >   < span class = "keywordflow" > return< / span > < a class = "code" href = "namespaceoperations__research.html#a6748db3fd54f3ca8e43f0c52b8efc938" > MixTwoUInt64< / a > (fp, last_bytes);< / div >
< div class = "line" > < a name = "l00050" > < / a > < span class = "lineno" > 50< / span >   }< / div >
< div class = "line" > < a name = "l00051" > < / a > < span class = "lineno" > 51< / span >   } < span class = "comment" > // namespace operations_research< / span > < / div >
< div class = "line" > < a name = "l00052" > < / a > < span class = "lineno" > 52< / span >   < / div >
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< div class = "line" > < a name = "l00053" > < / a > < span class = "lineno" > 53< / span >   < span class = "preprocessor" > #endif < / span > < span class = "comment" > // OR_TOOLS_BASE_THOROUGH_HASH_H_< / span > < / div >
< div class = "ttc" id = "aconstraint__solver_2table_8cc_html_af730895c6c6ef6e03caaf6251192dfd2" > < div class = "ttname" > < a href = "constraint__solver_2table_8cc.html#af730895c6c6ef6e03caaf6251192dfd2" > a< / a > < / div > < div class = "ttdeci" > int64 a< / div > < div class = "ttdef" > < b > Definition:< / b > < a href = "constraint__solver_2table_8cc_source.html#l00042" > constraint_solver/table.cc:42< / a > < / div > < / div >
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< div class = "ttc" id = "aintegral__types_8h_html" > < div class = "ttname" > < a href = "integral__types_8h.html" > integral_types.h< / a > < / div > < / div >
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< div class = "ttc" id = "aintegral__types_8h_html_abc0f5bc07737e498f287334775dff2b6" > < div class = "ttname" > < a href = "integral__types_8h.html#abc0f5bc07737e498f287334775dff2b6" > uint64< / a > < / div > < div class = "ttdeci" > uint64_t uint64< / div > < div class = "ttdef" > < b > Definition:< / b > < a href = "integral__types_8h_source.html#l00039" > integral_types.h:39< / a > < / div > < / div >
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< div class = "ttc" id = "anamespaceoperations__research_html" > < div class = "ttname" > < a href = "namespaceoperations__research.html" > operations_research< / a > < / div > < div class = "ttdoc" > The vehicle routing library lets one model and solve generic vehicle routing problems ranging from th...< / div > < div class = "ttdef" > < b > Definition:< / b > < a href = "dense__doubly__linked__list_8h_source.html#l00021" > dense_doubly_linked_list.h:21< / a > < / div > < / div >
< div class = "ttc" id = "anamespaceoperations__research_html_a6748db3fd54f3ca8e43f0c52b8efc938" > < div class = "ttname" > < a href = "namespaceoperations__research.html#a6748db3fd54f3ca8e43f0c52b8efc938" > operations_research::MixTwoUInt64< / a > < / div > < div class = "ttdeci" > uint64 MixTwoUInt64(uint64 fp1, uint64 fp2)< / div > < div class = "ttdef" > < b > Definition:< / b > < a href = "thorough__hash_8h_source.html#l00020" > thorough_hash.h:20< / a > < / div > < / div >
< div class = "ttc" id = "anamespaceoperations__research_html_a8627f242a0332f34d29d85b6c57f1224" > < div class = "ttname" > < a href = "namespaceoperations__research.html#a8627f242a0332f34d29d85b6c57f1224" > operations_research::ThoroughHash< / a > < / div > < div class = "ttdeci" > uint64 ThoroughHash(const char *bytes, size_t len)< / div > < div class = "ttdef" > < b > Definition:< / b > < a href = "thorough__hash_8h_source.html#l00033" > thorough_hash.h:33< / a > < / div > < / div >
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