68. Compile-Time Constant Check

#include <iostream>
using namespace std;

// Define a compile-time constant that satisfies static_assert
constexpr int a = 12;

int main() {
    // Compile-time validation
    static_assert(a == 12, "Failed");

    cout << "passed";
    return 0;
}

Explanation & Logic Summary:

• static_assert checks conditions during compilation, not at runtime.
• If a is incorrect, the program will not compile.
• Defining a as constexpr ensures its value is known at compile time.
• When a == 12, the static assertion passes and the program prints "passed".

Firmware Relevance & Real-World Context:
Embedded systems frequently use static_assert to validate compile-time configuration such as:

• pin numbers
• register sizes
• ADC resolution
• clock settings
• DMA alignment
• protocol frame sizes

This prevents invalid firmware configurations from ever reaching the device, improving reliability and safety.