Compile-Time

Read the Template Error

Difficulty

Asked at Flow Traders, Maven Securities

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Language: C++23triage

#include <array>
#include <cstddef>
#include <type_traits>

// ...
// ...
// ...
// ...
template <typename T>
struct Registry {
    using value_type = T;
    std::array<T, 4> slots{};

    template <std::size_t N>
    T get() const {
        return slots[N];
    }

    T total() const {
        T sum = 0;
        for (const T& v : slots) sum += v;
        return sum;
    }
};

template <typename T>
struct Scaler {
    T scale = 2;
    T scaled(T x) const { return x * scale; }
};

namespace triage {

// ...
// ...
// ...
// ...
// ...
// ...
// ...
template <typename R>
long long first_plus_second(const R& registry) {
    // ...
    // ...
    (void)registry;
    return 0;
}

// ...
// ...
// ...
// ...
// ...
// ...
template <typename T>
struct Derived : Scaler<T> {
    T twice(T x) const {
        // ...
        (void)x;
        return 0;
    }
};

// ...
// ...
// ...
// ...
// ...
// ...
// ...
template <typename R>
long long span_of(const R& registry) {
    // ...
    (void)registry;
    return 0;
}

}  // ...

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