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by eMSF
2497 days ago
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Only the first two expressions on the right are null pointer constants (integral constant expression with a value of 0, optionally cast as a void *), that can be used to initialize all pointer variables, including function pointers. The last one is merely a null pointer (to void), that can't be implicitly converted to a pointer to a function. C++ has stricter rules for null pointer constants, and thus only the first version is valid C++. |
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