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A Tour of C++ for experienced programmers, as if C++26 is the only version that ever existed.
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12345678910111213141516#include <iostream>
// Basic non‑type template parameter: size of an array.// The size N is a compile‑time constant supplied as a template argument.
template<int N>struct Arr { int data[N]{}; // array of N ints, default‑initialized to zero};
int main() { Arr<5> a; // N = 5 std::cout << "Arr size: " << sizeof(a) << " bytes" << std::endl; return 0;}