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Copy a substring to another string.
std::size_t copy( char* dest, std::size_t count, std::size_t pos = 0) const;
          Copies std::min(count, size() - pos) characters starting at index pos to the string pointed to by dest.
        
The resulting string is not null terminated.
The number of characters copied.
| Name | Description | 
|---|---|
| 
                     | The number of characters to copy. | 
| 
                     | The string to copy to. | 
| 
                     | 
                    The index to begin copying from. The default argument for this
                    parameter is  | 
| Type | Thrown On | 
|---|---|
| 
                     | 
                     |