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Count the number of elements with a specific key.
std::size_t count( string_view key) const;
          This function returns the count of the number of elements match key. The only possible return values
          are 0 and 1.
        
          Constant on average, worst case linear in size().
        
No-throw guarantee.
| Name | Description | 
|---|---|
| 
                     | The key of the element to find. |