How do I write clear API documentation in C++ projects?

Writing clear API documentation for C++ projects is essential for helping developers understand how to use your software effectively. Good API documentation should include a thorough description of the functions, classes, and methods available, along with examples of how to use them. It's important to maintain clarity and organization throughout your documentation to enhance usability.

Consider the following best practices when writing API documentation:

• Use consistent terminology and format throughout the documentation.
• Provide clear and concise descriptions of each function or method.
• Include example code snippets that demonstrate how to use the API effectively.
• Organize the documentation logically, possibly grouping related functions or classes together.
• Use diagrams or flowcharts where applicable to illustrate complex processes.

Below is an example of a simple C++ class with API documentation that adheres to these principles:

/**
 * @class MyMath
 * @brief A simple class for basic mathematical operations.
 *
 * This class provides methods to perform addition, subtraction,
 * multiplication, and division of two numbers.
 */
class MyMath {
public:
    /**
     * @brief Performs addition of two numbers.
     * @param a The first number.
     * @param b The second number.
     * @return The sum of a and b.
     */
    int add(int a, int b) {
        return a + b;
    }

    /**
     * @brief Performs subtraction of two numbers.
     * @param a The first number.
     * @param b The second number.
     * @return The difference of a and b.
     */
    int subtract(int a, int b) {
        return a - b;
    }

    /**
     * @brief Performs multiplication of two numbers.
     * @param a The first number.
     * @param b The second number.
     * @return The product of a and b.
     */
    int multiply(int a, int b) {
        return a * b;
    }

    /**
     * @brief Performs division of two numbers.
     * @param a The numerator.
     * @param b The denominator.
     * @return The quotient of a and b. Throws an exception if b is 0.
     */
    double divide(int a, int b) {
        if (b == 0) {
            throw std::invalid_argument("Division by zero");
        }
        return static_cast(a) / b;
    }
};