How Can I Convert a Pointer to an Integer for 32/64-Bit Compatibility?

Converting Pointer to Integer for 32/64-Bit Compatibility

In adapting legacy code to 64-bit machines, a common challenge is converting a void* argument to a compatible type within a function. To resolve this, let's explore a clean solution.

One approach is to leverage modern C techniques. For example, one can utilize the uintptr_t or intptr_t types, which are designed to represent integer values that can hold pointer values. To convert from a pointer to uintptr_t, reinterpret_cast is the appropriate method:

#include <cstdint>

void *p;
std::uintptr_t i = reinterpret_cast<std::uintptr_t>(p);

This approach ensures compatibility on both 32 and 64-bit machines, allowing you to safely access and manipulate pointer values as integers within the function.

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