Validation Result

A result struct returns both a success flag and a reason code.

validation_result.cpp

#include <iostream>

struct Validation {
    bool ok;
    int code;
};

Validation validateAge(int age) {
    if (age < 0) {
        return {false, 1};
    }
    if (age < 18) {
        return {false, 2};
    }
    return {true, 0};
}

int main() {
    int age = ;

    Validation result = validateAge(age);

    std::cout << "age=" << age << std::endl;
    std::cout << "ok=" << result.ok << std::endl;
    std::cout << "code=" << result.code << std::endl;
    return 0;
}

#include <iostream>

struct Validation {
    bool ok;
    int code;
};

Validation validateAge(int age) {
    if (age < 0) {
        return {false, 1};
    }
    if (age < 18) {
        return {false, 2};
    }
    return {true, 0};
}

int main() {
    int age = ;

    Validation result = validateAge(age);

    std::cout << "age=" << age << std::endl;
    std::cout << "ok=" << result.ok << std::endl;
    std::cout << "code=" << result.code << std::endl;
    return 0;
}

#include <iostream>

struct Validation {
    bool ok;
    int code;
};

Validation validateAge(int age) {
    if (age < 0) {
        return {false, 1};
    }
    if (age < 18) {
        return {false, 2};
    }
    return {true, 0};
}

int main() {
    int age = ;

    Validation result = validateAge(age);

    std::cout << "age=" << age << std::endl;
    std::cout << "ok=" << result.ok << std::endl;
    std::cout << "code=" << result.code << std::endl;
    return 0;
}

result Return a small result object when the caller needs more than true or false.

reason Reason codes let the caller distinguish invalid input from input that is merely incomplete.