import std.range : zip;

import std.stdio : writeln, write;

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struct Result {

    byte[] set;

}

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alias Callback = bool function();

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Callback[] checkers;

Result result;

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bool false_cb() { return 0; }

bool true_cb() { return 1; }

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void init() {

    checkers ~= &false_cb;

    checkers ~= &false_cb;

    checkers ~= &true_cb;

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    result.set.length = checkers.length;

}

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void check() {

    foreach(checker, ref r; zip(checkers, result.set)) {

        r = checker();

    }

}

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void print() {

    foreach(r; result.set) {

        write(r, " ");

    }

    writeln();

}

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void main() {

    init();

    check();

    print();

}

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