std::transform

cppreference.com

Example

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print_ordinals: (ordinals: std::vector<unsigned>) = {
    std::cout << "ordinals: ";
    for ordinals do (ord: unsigned) {
        std::cout << std::setw(3) << ord << ' ';
    }
    std::cout << '\n';
}

to_uppercase: (c: char) -> char = {
    return unsafe_narrow<char>(std::toupper(c));
}

to_uppercase_inplace: (inout c: char) = {
    c = to_uppercase(c);
}

unary_transform_example: (inout hello: std::string, copy world: std::string) = {
    // Transform string to uppercase in-place
    std::transform(hello.cbegin(), hello.cend(), hello.begin(), to_uppercase);
    std::cout << "hello = " << std::quoted(hello) << '\n';

    // for_each version
    std::for_each(world.begin(), world.end(), to_uppercase_inplace);
    std::cout << "world = " << std::quoted(world) << '\n';
}

binary_transform_example: (move ordinals: std::vector<unsigned>) = {
    // Transform numbers to doubled values
    print_ordinals(ordinals);

    std::transform(ordinals.cbegin(), ordinals.cend(), ordinals.cbegin(),
                   ordinals.begin(), std::plus<>());
 
    print_ordinals(ordinals);
}

main: () = {
    hello: std::string = ("hello");
    unary_transform_example(hello, "world");

    ordinals: std::vector<unsigned> = ();
    std::copy(hello.cbegin(), hello.cend(), std::back_inserter(ordinals));
    binary_transform_example(move ordinals);
}

Output

hello = "HELLO"
world = "WORLD"
ordinals:  72  69  76  76  79 
ordinals: 144 138 152 152 158