[GitHub] [incubator-tvm] tqchen commented on issue #4628: [Object] Add String container

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tqchen commented on issue #4628: [Object] Add String container
URL: https://github.com/apache/incubator-tvm/pull/4628#issuecomment-583765522
 
 
   
   @wweic here is an code snippet that we can reuse for hash. We should 
consider migrate to require c++14, which will give us string view support
   
   ```
   #define TVM_USE_CXX14_STRING_VIEW                                       \
     defined(__cpp_lib_experimental_string_view) && 
__cpp_lib_experimental_string_view >= 201411
   
   #define TVM_USE_CXX17_STRING_VIEW                                       \
     defined(__cpp_lib_string_view) && __cpp_lib_string_view >= 201606
   
   #include <string>
   #include <dmlc/logging.h>
   
   #if TVM_USE_CXX17_STRING_VIEW
   #include <string_view>
   #elif TVM_USE_CXX14_STRING_VIEW
   #include <experimental/string_view>
   #endif
   
   int main(int argc, char* argv[]) {
     std::string xyz = "xyz";
   
   #if TVM_USE_CXX17_STRING_VIEW
     LOG(INFO) << "C++17=" << std::hash<std::string_view>()(xyz);
   #elif TVM_USE_CXX14_STRING_VIEW
     LOG(INFO) << "C++14=" << std::hash<std::experimental::string_view>()(xyz);
   #else
     LOG(INFO) << "C++11=" << std::hash<std::string>()(xyz);
   #endif
     return 0;
   }
   
   ```

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