How come const char* is automatically transformed to bool instead of std::string?

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In C++, a const char* can be used as a boolean value because it can be either null or not null. If the pointer is null, it is equivalent to false, and if it points to a non-null value, it is equivalent to true. This behavior is inherited from C, where null pointers are used to indicate errors or uninitialized values.

On the other hand, transforming a const char* to a std::string requires an explicit conversion, as the two types are not directly related. While it is possible to implicitly convert a const char* to a std::string in some cases, it is generally discouraged for clarity and readability reasons. It is better to use an explicit conversion, such as using the std::string constructor that takes a const char* as an argument.