cxx-ring-buffer/test/push-iterate-const-constexpr.cpp

#include <array>
#include <ring-buffer.h>

#ifdef RING_BUFFER_CONSTEXPR
#include "constexpr-array-shim.h"

template <typename T, size_t N>
constexpr bool array_equal(const constexpr_array<T, N>& a, const constexpr_array<T, N>& b) {
    for (size_t i = 0; i < N; i++) {
        if (a[i] != b[i]) return false;
    }

    return true;
}

constexpr bool test() {
    constexpr_array<int, 4> init{0, 0, 0, 0};
    basic_ring_buffer<constexpr_array<int, 4>> buf(init);
    const basic_ring_buffer<constexpr_array<int, 4>>& const_buf = buf;

    buf.push_back(1);
    buf.push_back(2);
    buf.push_back(3);
    buf.push_back(4);
    buf.push_back(5);
    buf.push_back(6);

    {
        constexpr_array<int, 4> expected{3, 4, 5, 6};
        constexpr_array<int, 4> actual{0, 0, 0, 0};
        int actual_index = 0;
        for (const int& i : const_buf) {
            actual[actual_index++] = i;
        }
        if (!array_equal(actual, expected)) return false;
    }

    buf.push_back(7);

    {
        constexpr_array<int, 4> expected{4, 5, 6, 7};
        constexpr_array<int, 4> actual{0, 0, 0, 0};
        int actual_index = 0;
        for (const int& i : const_buf) {
            actual[actual_index++] = i;
        }
        if (!array_equal(actual, expected)) return false;
    }

    return true;
}

static_assert(test(), "");
#endif

int main() {}