45 lines
1 KiB
C++
45 lines
1 KiB
C++
#include <cstddef>
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#include <iostream>
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// In C we need a length in bytes to check for equality
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void compareObject(void *a, void *b, size_t len) {
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if (a == b)
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std::cout << "Same address" << std::endl;
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// Being explicit about pointer type allows pointer arithmetic
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unsigned char *i1 = (unsigned char *)a;
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unsigned char *i2 = (unsigned char *)b;
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for (size_t i = 0; i < len; i++) {
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if (i1[i] != i2[i]) {
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std::cout << "Different value" << std::endl;
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return;
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}
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}
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std::cout << "Same value" << std::endl;
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}
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template <typename T> void cmp(T &a, T &b) {
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if (&a == &b)
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std::cout << "Same object" << std::endl;
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if (a == b)
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std::cout << "Same value" << std::endl;
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else
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std::cout << "Different value" << std::endl;
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}
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int main() {
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int a = 10, b = 10, c = 12;
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std::cout << "Checking template version" << std::endl;
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cmp(a, b);
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cmp(a, c);
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std::cout << "Checking C version" << std::endl;
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compareObject(&a, &b, sizeof(int));
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compareObject(&a, &c, sizeof(int));
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}
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