merge(3p/immer): Subtree merge at 'ad3e3556d' as 'third_party/immer' r/1299

Change-Id: I9636a41ad44b4218293833fd3e9456d9b07c731b

1 files changed, 599 insertions, 0 deletions

diff --git a/third_party/immer/test/flex_vector/generic.ipp b/third_party/immer/test/flex_vector/generic.ipp
new file mode 100644
index 000000000000..6dbd73f07cb6
--- /dev/null
+++ b/third_party/immer/test/flex_vector/generic.ipp
@@ -0,0 +1,599 @@
+//
+// immer: immutable data structures for C++
+// Copyright (C) 2016, 2017, 2018 Juan Pedro Bolivar Puente
+//
+// This software is distributed under the Boost Software License, Version 1.0.
+// See accompanying file LICENSE or copy at http://boost.org/LICENSE_1_0.txt
+//
+
+#include "test/dada.hpp"
+#include "test/transient_tester.hpp"
+#include "test/util.hpp"
+
+#include <immer/algorithm.hpp>
+
+#include <boost/range/adaptors.hpp>
+#include <boost/range/irange.hpp>
+#include <catch.hpp>
+
+#include <algorithm>
+#include <array>
+#include <numeric>
+#include <vector>
+
+#ifndef FLEX_VECTOR_T
+#error "define the vector template to use in FLEX_VECTOR_T"
+#endif
+
+#ifndef VECTOR_T
+#error "define the vector template to use in VECTOR_T"
+#endif
+
+template <typename V = FLEX_VECTOR_T<unsigned>>
+auto make_test_flex_vector(unsigned min, unsigned max)
+{
+    auto v = V{};
+    for (auto i = min; i < max; ++i)
+        v = v.push_back({i});
+    return v;
+}
+
+template <typename V = FLEX_VECTOR_T<unsigned>>
+auto make_test_flex_vector_front(unsigned min, unsigned max)
+{
+    auto v = V{};
+    for (auto i = max; i > min;)
+        v = v.push_front({--i});
+    return v;
+}
+
+template <std::size_t N>
+auto make_many_test_flex_vector()
+{
+    using vektor_t = FLEX_VECTOR_T<unsigned>;
+    auto many      = std::array<vektor_t, N>{};
+    std::generate_n(many.begin(), N, [v = vektor_t{}, i = 0u]() mutable {
+        auto r = v;
+        v      = v.push_back(i++);
+        return r;
+    });
+    return many;
+}
+
+template <std::size_t N>
+auto make_many_test_flex_vector_front()
+{
+    using vektor_t = FLEX_VECTOR_T<unsigned>;
+    auto many      = std::array<vektor_t, N>{};
+    std::generate_n(many.begin(), N, [i = 0u]() mutable {
+        return make_test_flex_vector_front(0, i++);
+    });
+    return many;
+}
+
+template <std::size_t N>
+auto make_many_test_flex_vector_front_remainder()
+{
+    using vektor_t = FLEX_VECTOR_T<unsigned>;
+    auto many      = std::array<vektor_t, N>{};
+    std::generate_n(many.begin(), N, [v = vektor_t{}, i = N - 1]() mutable {
+        auto r = v;
+        v      = v.push_front(--i);
+        return r;
+    });
+    return many;
+}
+
+TEST_CASE("set relaxed")
+{
+    auto v = make_test_flex_vector_front(0, 666u);
+    for (decltype(v.size()) i = 0; i < v.size(); ++i) {
+        v = v.set(i, i + 1);
+        CHECK(v[i] == i + 1);
+    }
+}
+
+TEST_CASE("push_front")
+{
+    const auto n = 666u;
+    auto v       = FLEX_VECTOR_T<unsigned>{};
+
+    for (auto i = 0u; i < n; ++i) {
+        v = v.push_front(i);
+        CHECK(v.size() == i + 1);
+        for (decltype(v.size()) j = 0; j < v.size(); ++j)
+            CHECK(v[v.size() - j - 1] == j);
+    }
+}
+
+TEST_CASE("concat")
+{
+#if IMMER_SLOW_TESTS
+    constexpr auto n = 666u;
+#else
+    constexpr auto n = 101u;
+#endif
+
+    auto all_lhs = make_many_test_flex_vector<n>();
+    auto all_rhs = make_many_test_flex_vector_front_remainder<n>();
+
+    SECTION("regular plus regular")
+    {
+        for (auto i : test_irange(0u, n)) {
+            auto c = all_lhs[i] + all_lhs[i];
+            CHECK_VECTOR_EQUALS(
+                c, boost::join(boost::irange(0u, i), boost::irange(0u, i)));
+        }
+    }
+
+    SECTION("regular plus relaxed")
+    {
+        for (auto i : test_irange(0u, n)) {
+            auto c = all_lhs[i] + all_rhs[n - i - 1];
+            CHECK_VECTOR_EQUALS(c, boost::irange(0u, n - 1));
+        }
+    }
+}
+
+auto make_flex_vector_concat(std::size_t min, std::size_t max)
+{
+    using vektor_t = FLEX_VECTOR_T<unsigned>;
+
+    if (max == min)
+        return vektor_t{};
+    else if (max == min + 1)
+        return vektor_t{}.push_back(min);
+    else {
+        auto mid = min + (max - min) / 2;
+        return make_flex_vector_concat(min, mid) +
+               make_flex_vector_concat(mid, max);
+    }
+}
+
+TEST_CASE("concat recursive")
+{
+    const auto n = 666u;
+    auto v       = make_flex_vector_concat(0, n);
+    CHECK_VECTOR_EQUALS(v, boost::irange(0u, n));
+}
+
+TEST_CASE("insert")
+{
+    SECTION("normal")
+    {
+        const auto n = 666u;
+        auto v       = make_test_flex_vector(0, n);
+        v            = v.insert(42, 100);
+        CHECK_VECTOR_EQUALS(v,
+                            boost::join(boost::irange(0u, 42u),
+                                        boost::join(boost::irange(100u, 101u),
+                                                    boost::irange(42u, n))));
+    }
+
+    SECTION("move")
+    {
+        const auto n = 666u;
+        auto v       = make_test_flex_vector(0, n);
+        v            = std::move(v).insert(42, 100);
+        CHECK_VECTOR_EQUALS(v,
+                            boost::join(boost::irange(0u, 42u),
+                                        boost::join(boost::irange(100u, 101u),
+                                                    boost::irange(42u, n))));
+    }
+
+    SECTION("vec")
+    {
+        const auto n = 666u;
+        auto v       = make_test_flex_vector(0, n);
+        v            = std::move(v).insert(42, {100, 101, 102});
+        CHECK_VECTOR_EQUALS(v,
+                            boost::join(boost::irange(0u, 42u),
+                                        boost::join(boost::irange(100u, 103u),
+                                                    boost::irange(42u, n))));
+    }
+
+    SECTION("vec move")
+    {
+        const auto n = 666u;
+        auto v       = make_test_flex_vector(0, n);
+        v            = std::move(v).insert(42, {100, 101, 102});
+        CHECK_VECTOR_EQUALS(v,
+                            boost::join(boost::irange(0u, 42u),
+                                        boost::join(boost::irange(100u, 103u),
+                                                    boost::irange(42u, n))));
+    }
+}
+
+TEST_CASE("erase")
+{
+    const auto n = 666u;
+    auto v       = make_test_flex_vector(0, n);
+    auto vv      = v.erase(0);
+    CHECK_VECTOR_EQUALS(vv, boost::irange(1u, n));
+    CHECK_VECTOR_EQUALS(v.erase(v.size() - 1), boost::irange(0u, n - 1));
+    CHECK_VECTOR_EQUALS(v.erase(v.size() - 1), boost::irange(0u, n - 1));
+    CHECK_VECTOR_EQUALS(
+        v.erase(42),
+        boost::join(boost::irange(0u, 42u), boost::irange(43u, n)));
+    CHECK_VECTOR_EQUALS(v.erase(v.size() - 1, v.size()),
+                        boost::irange(0u, n - 1));
+    CHECK_VECTOR_EQUALS(v.erase(0, 0), boost::irange(0u, n));
+    CHECK_VECTOR_EQUALS(
+        v.erase(42, 50),
+        boost::join(boost::irange(0u, 42u), boost::irange(50u, n)));
+}
+
+TEST_CASE("accumulate relaxed")
+{
+    auto expected_n = [](auto n) { return n * (n - 1) / 2; };
+    auto expected_i = [&](auto i, auto n) {
+        return expected_n(n) - expected_n(i);
+    };
+
+    SECTION("sum")
+    {
+        const auto n = 666u;
+        auto v       = make_test_flex_vector_front(0, n);
+
+        auto sum      = immer::accumulate(v, 0u);
+        auto expected = v.size() * (v.size() - 1) / 2;
+        CHECK(sum == expected);
+    }
+
+    SECTION("sum complex")
+    {
+        const auto n = 20u;
+
+        auto v = FLEX_VECTOR_T<unsigned>{};
+        for (auto i = 0u; i < n; ++i)
+            v = v.push_front(i) + v;
+
+        auto sum      = immer::accumulate(v, 0u);
+        auto expected = (1 << n) - n - 1;
+        CHECK(sum == expected);
+    }
+
+    SECTION("sum range")
+    {
+        using namespace std;
+        const auto n = 666u;
+        auto v       = make_test_flex_vector_front(0, n);
+        {
+            auto sum = immer::accumulate(begin(v) + 100, begin(v) + 300, 0u);
+            CHECK(sum == expected_i(100, 300));
+        }
+        {
+            auto sum = immer::accumulate(begin(v) + 31, begin(v) + 300, 0u);
+            CHECK(sum == expected_i(31, 300));
+        }
+        {
+            auto sum = immer::accumulate(begin(v), begin(v) + 33, 0u);
+            CHECK(sum == expected_i(0, 33));
+        }
+        {
+            auto sum = immer::accumulate(begin(v) + 100, begin(v) + 660, 0u);
+            CHECK(sum == expected_i(100, 660));
+        }
+        {
+            auto sum = immer::accumulate(begin(v) + 100, begin(v) + 105, 0u);
+            CHECK(sum == expected_i(100, 105));
+        }
+        {
+            auto sum = immer::accumulate(begin(v) + 660, begin(v) + 664, 0u);
+            CHECK(sum == expected_i(660, 664));
+        }
+    }
+}
+
+TEST_CASE("equals")
+{
+    const auto n = 666u;
+    auto v       = make_test_flex_vector_front(0, n);
+
+    CHECK(v == v);
+    CHECK(v == v.set(42, 42));
+    CHECK(v != v.set(42, 24));
+    CHECK(v == v.set(42, 24).set(42, 42));
+    CHECK(v.set(42, 24) == v.set(42, 24));
+    CHECK(v != v.push_back(7));
+    CHECK(v.push_back(7) == v.push_back(7));
+    CHECK(v.push_back(5) != v.push_back(7));
+    CHECK(v != v.set(v.size() - 2, 24));
+    CHECK(v == v.set(v.size() - 2, 24).set(v.size() - 2, v[v.size() - 2]));
+    CHECK(v == v.insert(42, 12).erase(42));
+    CHECK(v == v.insert(0, 12).erase(0));
+}
+
+TEST_CASE("equals bugs")
+{
+    {
+        const auto n = 666u;
+        auto v       = make_test_flex_vector(0, n);
+        CHECK(v == v.insert(42, 12).erase(42));
+        CHECK(v == v.insert(0, 12).erase(0));
+    }
+    {
+        const auto n = 30u;
+        auto v       = make_test_flex_vector(0, n);
+        CHECK(v == v.insert(10, 12).erase(10));
+        CHECK(v == v.insert(0, 12).erase(0));
+    }
+    {
+        const auto n = 666u;
+        auto v       = make_test_flex_vector(0, n);
+        for (auto i : test_irange(0u, n))
+            CHECK(v == v.insert(i, 42).erase(i));
+    }
+    {
+        const auto n = 666u;
+        auto v       = make_test_flex_vector_front(0, n);
+        for (auto i : test_irange(0u, n))
+            CHECK(v == v.insert(i, 42).erase(i));
+    }
+    {
+        const auto n = 666u;
+        auto v       = FLEX_VECTOR_T<unsigned>{};
+        using size_t = decltype(v.size());
+        for (auto i : test_irange(0u, n)) {
+            while (v.size() < i)
+                v = std::move(v).push_back(i);
+            auto vv = v;
+            for (auto j : test_irange(size_t{}, v.size())) {
+                auto vz = vv.insert(j, 42).erase(j);
+                CHECK(v == vz);
+                CHECK(vv == vz);
+                vv = vz;
+            }
+        }
+    }
+}
+
+TEST_CASE("take relaxed")
+{
+    const auto n = 666u;
+    auto v       = make_test_flex_vector_front(0, n);
+
+    for (auto i : test_irange(0u, n)) {
+        auto vv = v.take(i);
+        CHECK_VECTOR_EQUALS_RANGE(vv, v.begin(), v.begin() + i);
+    }
+}
+
+TEST_CASE("drop")
+{
+    const auto n = 666u;
+
+    SECTION("regular")
+    {
+        auto v = make_test_flex_vector(0, n);
+
+        for (auto i : test_irange(0u, n)) {
+            auto vv = v.drop(i);
+            CHECK_VECTOR_EQUALS_RANGE(vv, v.begin() + i, v.end());
+        }
+    }
+
+    SECTION("relaxed")
+    {
+        auto v = make_test_flex_vector_front(0, n);
+
+        for (auto i : test_irange(0u, n)) {
+            auto vv = v.drop(i);
+            CHECK_VECTOR_EQUALS_RANGE(vv, v.begin() + i, v.end());
+        }
+    }
+}
+
+#if IMMER_SLOW_TESTS
+TEST_CASE("reconcat")
+{
+    constexpr auto n = 666u;
+    auto v           = make_test_flex_vector_front(0, n);
+    auto all_lhs     = make_many_test_flex_vector_front<n + 1>();
+    auto all_rhs     = make_many_test_flex_vector_front_remainder<n + 1>();
+
+    for (auto i = 0u; i < n; ++i) {
+        auto vv = all_lhs[i] + all_rhs[n - i];
+        CHECK_VECTOR_EQUALS(vv, v);
+        CHECK_SLOW(vv == v);
+    }
+}
+
+TEST_CASE("reconcat drop")
+{
+    constexpr auto n = 666u;
+    auto v           = make_test_flex_vector_front(0, n);
+    auto all_lhs     = make_many_test_flex_vector_front<n + 1>();
+
+    for (auto i = 0u; i < n; ++i) {
+        auto vv = all_lhs[i] + v.drop(i);
+        CHECK_VECTOR_EQUALS(vv, v);
+        CHECK_SLOW(vv == v);
+    }
+}
+
+TEST_CASE("reconcat take")
+{
+    constexpr auto n = 666u;
+    auto v           = make_test_flex_vector_front(0, n);
+    auto all_rhs     = make_many_test_flex_vector_front_remainder<n + 1>();
+
+    for (auto i = 0u; i < n; ++i) {
+        auto vv = v.take(i) + all_rhs[n - i];
+        CHECK_VECTOR_EQUALS(vv, v);
+        CHECK_SLOW(vv == v);
+    }
+}
+#endif
+
+TEST_CASE("reconcat take drop")
+{
+    const auto n = 666u;
+    auto v       = make_test_flex_vector_front(0, n);
+
+    for (auto i : test_irange(0u, n)) {
+        auto vv = v.take(i) + v.drop(i);
+        CHECK_VECTOR_EQUALS(vv, v);
+        CHECK_SLOW(vv == v);
+    }
+}
+
+TEST_CASE("reconcat take drop feedback")
+{
+    const auto n = 666u;
+    auto v       = make_test_flex_vector_front(0, n);
+    auto vv      = v;
+    for (auto i : test_irange(0u, n)) {
+        vv = vv.take(i) + vv.drop(i);
+        CHECK_VECTOR_EQUALS(vv, v);
+        CHECK_SLOW(vv == v);
+    }
+}
+
+TEST_CASE("iterator relaxed")
+{
+    const auto n = 666u;
+    auto v       = make_test_flex_vector_front(0, n);
+
+    SECTION("works with range loop")
+    {
+        auto i = 0u;
+        for (const auto& x : v)
+            CHECK(x == i++);
+        CHECK(i == v.size());
+    }
+
+    SECTION("works with standard algorithms")
+    {
+        auto s = std::vector<unsigned>(n);
+        std::iota(s.begin(), s.end(), 0u);
+        std::equal(v.begin(), v.end(), s.begin(), s.end());
+    }
+
+    SECTION("can go back from end")
+    {
+        auto expected = n - 1;
+        CHECK(expected == *--v.end());
+    }
+
+    SECTION("works with reversed range adaptor")
+    {
+        auto r = v | boost::adaptors::reversed;
+        auto i = n;
+        for (const auto& x : r)
+            CHECK(x == --i);
+    }
+
+    SECTION("works with strided range adaptor")
+    {
+        auto r = v | boost::adaptors::strided(5);
+        auto i = 0u;
+        for (const auto& x : r)
+            CHECK(x == 5 * i++);
+    }
+
+    SECTION("works reversed")
+    {
+        auto i = n;
+        for (auto iter = v.rbegin(), last = v.rend(); iter != last; ++iter)
+            CHECK(*iter == --i);
+    }
+
+    SECTION("advance and distance")
+    {
+        auto i1 = v.begin();
+        auto i2 = i1 + 100;
+        CHECK(100u == *i2);
+        CHECK(100 == i2 - i1);
+        CHECK(50u == *(i2 - 50));
+        CHECK(-30 == (i2 - 30) - i2);
+    }
+}
+
+TEST_CASE("adopt regular vector contents")
+{
+    const auto n = 666u;
+    auto v       = VECTOR_T<unsigned>{};
+    for (auto i = 0u; i < n; ++i) {
+        v       = v.push_back(i);
+        auto fv = FLEX_VECTOR_T<unsigned>{v};
+        CHECK_VECTOR_EQUALS_AUX(v, fv, [](auto&& v) { return &v; });
+    }
+}
+
+TEST_CASE("exception safety relaxed")
+{
+    using dadaist_vector_t =
+        typename dadaist_wrapper<FLEX_VECTOR_T<unsigned>>::type;
+    constexpr auto n = 666u;
+
+    SECTION("push back")
+    {
+        auto half = n / 2;
+        auto v    = make_test_flex_vector_front<dadaist_vector_t>(0, half);
+        auto d    = dadaism{};
+        for (auto i = half; v.size() < static_cast<decltype(v.size())>(n);) {
+            auto s = d.next();
+            try {
+                v = v.push_back({i});
+                ++i;
+            } catch (dada_error) {}
+            CHECK_VECTOR_EQUALS(v, boost::irange(0u, i));
+        }
+        CHECK(d.happenings > 0);
+        IMMER_TRACE_E(d.happenings);
+    }
+
+    SECTION("update")
+    {
+        auto v = make_test_flex_vector_front<dadaist_vector_t>(0, n);
+        auto d = dadaism{};
+        for (auto i = 0u; i < n;) {
+            auto s = d.next();
+            try {
+                v = v.update(i, [](auto x) { return dada(), x + 1; });
+                ++i;
+            } catch (dada_error) {}
+            CHECK_VECTOR_EQUALS(
+                v, boost::join(boost::irange(1u, 1u + i), boost::irange(i, n)));
+        }
+        CHECK(d.happenings > 0);
+        IMMER_TRACE_E(d.happenings);
+    }
+
+    SECTION("take")
+    {
+        auto v = make_test_flex_vector_front<dadaist_vector_t>(0, n);
+        auto d = dadaism{};
+        for (auto i = 0u; i < n;) {
+            auto s = d.next();
+            auto r = dadaist_vector_t{};
+            try {
+                r = v.take(i);
+                CHECK_VECTOR_EQUALS(r, boost::irange(0u, i++));
+            } catch (dada_error) {
+                CHECK_VECTOR_EQUALS(r, boost::irange(0u, 0u));
+            }
+        }
+        CHECK(d.happenings > 0);
+        IMMER_TRACE_E(d.happenings);
+    }
+
+    SECTION("concat")
+    {
+        auto v = make_test_flex_vector<dadaist_vector_t>(0, n);
+        auto d = dadaism{};
+        for (auto i = 0u; i < n;) {
+            auto lhs = v.take(i);
+            auto rhs = v.drop(i);
+            auto s   = d.next();
+            try {
+                v = lhs + rhs;
+                ++i;
+            } catch (dada_error) {}
+            CHECK_VECTOR_EQUALS(v, boost::irange(0u, n));
+        }
+        CHECK(d.happenings > 0);
+        IMMER_TRACE_E(d.happenings);
+    }
+}