Compile-Time Constant Check

Question

Problem: Compile-Time Constant Check. Solve this hands-on electronics task on EWskills.

Accepted Answer

#include 
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.

68. Compile-Time Constant Check