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llvm-project/llvm/unittests/ADT/STLExtrasTest.cpp

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//===- STLExtrasTest.cpp - Unit tests for STL extras ----------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "llvm/ADT/STLExtras.h"
#include "gtest/gtest.h"
#include <list>
#include <vector>
using namespace llvm;
namespace {
int f(rank<0>) { return 0; }
int f(rank<1>) { return 1; }
int f(rank<2>) { return 2; }
int f(rank<4>) { return 4; }
TEST(STLExtrasTest, Rank) {
// We shouldn't get ambiguities and should select the overload of the same
// rank as the argument.
EXPECT_EQ(0, f(rank<0>()));
EXPECT_EQ(1, f(rank<1>()));
EXPECT_EQ(2, f(rank<2>()));
// This overload is missing so we end up back at 2.
EXPECT_EQ(2, f(rank<3>()));
// But going past 3 should work fine.
EXPECT_EQ(4, f(rank<4>()));
// And we can even go higher and just fall back to the last overload.
EXPECT_EQ(4, f(rank<5>()));
EXPECT_EQ(4, f(rank<6>()));
}
TEST(STLExtrasTest, EnumerateLValue) {
// Test that a simple LValue can be enumerated and gives correct results with
// multiple types, including the empty container.
std::vector<char> foo = {'a', 'b', 'c'};
typedef std::pair<std::size_t, char> CharPairType;
std::vector<CharPairType> CharResults;
for (auto X : llvm::enumerate(foo)) {
CharResults.emplace_back(X.index(), X.value());
}
ASSERT_EQ(3u, CharResults.size());
EXPECT_EQ(CharPairType(0u, 'a'), CharResults[0]);
EXPECT_EQ(CharPairType(1u, 'b'), CharResults[1]);
EXPECT_EQ(CharPairType(2u, 'c'), CharResults[2]);
// Test a const range of a different type.
typedef std::pair<std::size_t, int> IntPairType;
std::vector<IntPairType> IntResults;
const std::vector<int> bar = {1, 2, 3};
for (auto X : llvm::enumerate(bar)) {
IntResults.emplace_back(X.index(), X.value());
}
ASSERT_EQ(3u, IntResults.size());
EXPECT_EQ(IntPairType(0u, 1), IntResults[0]);
EXPECT_EQ(IntPairType(1u, 2), IntResults[1]);
EXPECT_EQ(IntPairType(2u, 3), IntResults[2]);
// Test an empty range.
IntResults.clear();
const std::vector<int> baz{};
for (auto X : llvm::enumerate(baz)) {
IntResults.emplace_back(X.index(), X.value());
}
EXPECT_TRUE(IntResults.empty());
}
TEST(STLExtrasTest, EnumerateModifyLValue) {
// Test that you can modify the underlying entries of an lvalue range through
// the enumeration iterator.
std::vector<char> foo = {'a', 'b', 'c'};
for (auto X : llvm::enumerate(foo)) {
++X.value();
}
EXPECT_EQ('b', foo[0]);
EXPECT_EQ('c', foo[1]);
EXPECT_EQ('d', foo[2]);
}
TEST(STLExtrasTest, EnumerateRValueRef) {
// Test that an rvalue can be enumerated.
typedef std::pair<std::size_t, int> PairType;
std::vector<PairType> Results;
auto Enumerator = llvm::enumerate(std::vector<int>{1, 2, 3});
for (auto X : llvm::enumerate(std::vector<int>{1, 2, 3})) {
Results.emplace_back(X.index(), X.value());
}
ASSERT_EQ(3u, Results.size());
EXPECT_EQ(PairType(0u, 1), Results[0]);
EXPECT_EQ(PairType(1u, 2), Results[1]);
EXPECT_EQ(PairType(2u, 3), Results[2]);
}
TEST(STLExtrasTest, EnumerateModifyRValue) {
// Test that when enumerating an rvalue, modification still works (even if
// this isn't terribly useful, it at least shows that we haven't snuck an
// extra const in there somewhere.
typedef std::pair<std::size_t, char> PairType;
std::vector<PairType> Results;
for (auto X : llvm::enumerate(std::vector<char>{'1', '2', '3'})) {
++X.value();
Results.emplace_back(X.index(), X.value());
}
ASSERT_EQ(3u, Results.size());
EXPECT_EQ(PairType(0u, '2'), Results[0]);
EXPECT_EQ(PairType(1u, '3'), Results[1]);
EXPECT_EQ(PairType(2u, '4'), Results[2]);
}
template <bool B> struct CanMove {};
template <> struct CanMove<false> {
CanMove(CanMove &&) = delete;
CanMove() = default;
CanMove(const CanMove &) = default;
};
template <bool B> struct CanCopy {};
template <> struct CanCopy<false> {
CanCopy(const CanCopy &) = delete;
CanCopy() = default;
CanCopy(CanCopy &&) = default;
};
template <bool Moveable, bool Copyable>
struct Range : CanMove<Moveable>, CanCopy<Copyable> {
explicit Range(int &C, int &M, int &D) : C(C), M(M), D(D) {}
Range(const Range &R) : CanCopy<Copyable>(R), C(R.C), M(R.M), D(R.D) { ++C; }
Range(Range &&R) : CanMove<Moveable>(std::move(R)), C(R.C), M(R.M), D(R.D) {
++M;
}
~Range() { ++D; }
int &C;
int &M;
int &D;
int *begin() { return nullptr; }
int *end() { return nullptr; }
};
TEST(STLExtrasTest, EnumerateLifetimeSemantics) {
// Test that when enumerating lvalues and rvalues, there are no surprise
// copies or moves.
// With an rvalue, it should not be destroyed until the end of the scope.
int Copies = 0;
int Moves = 0;
int Destructors = 0;
{
auto E1 = enumerate(Range<true, false>(Copies, Moves, Destructors));
// Doesn't compile. rvalue ranges must be moveable.
// auto E2 = enumerate(Range<false, true>(Copies, Moves, Destructors));
EXPECT_EQ(0, Copies);
EXPECT_EQ(1, Moves);
EXPECT_EQ(1, Destructors);
}
EXPECT_EQ(0, Copies);
EXPECT_EQ(1, Moves);
EXPECT_EQ(2, Destructors);
Copies = Moves = Destructors = 0;
// With an lvalue, it should not be destroyed even after the end of the scope.
// lvalue ranges need be neither copyable nor moveable.
Range<false, false> R(Copies, Moves, Destructors);
{
auto Enumerator = enumerate(R);
(void)Enumerator;
EXPECT_EQ(0, Copies);
EXPECT_EQ(0, Moves);
EXPECT_EQ(0, Destructors);
}
EXPECT_EQ(0, Copies);
EXPECT_EQ(0, Moves);
EXPECT_EQ(0, Destructors);
}
TEST(STLExtrasTest, ApplyTuple) {
auto T = std::make_tuple(1, 3, 7);
auto U = llvm::apply_tuple(
[](int A, int B, int C) { return std::make_tuple(A - B, B - C, C - A); },
T);
EXPECT_EQ(-2, std::get<0>(U));
EXPECT_EQ(-4, std::get<1>(U));
EXPECT_EQ(6, std::get<2>(U));
auto V = llvm::apply_tuple(
[](int A, int B, int C) {
return std::make_tuple(std::make_pair(A, char('A' + A)),
std::make_pair(B, char('A' + B)),
std::make_pair(C, char('A' + C)));
},
T);
EXPECT_EQ(std::make_pair(1, 'B'), std::get<0>(V));
EXPECT_EQ(std::make_pair(3, 'D'), std::get<1>(V));
EXPECT_EQ(std::make_pair(7, 'H'), std::get<2>(V));
}
class apply_variadic {
static int apply_one(int X) { return X + 1; }
static char apply_one(char C) { return C + 1; }
static StringRef apply_one(StringRef S) { return S.drop_back(); }
public:
template <typename... Ts> auto operator()(Ts &&... Items) {
return std::make_tuple(apply_one(Items)...);
}
};
TEST(STLExtrasTest, ApplyTupleVariadic) {
auto Items = std::make_tuple(1, llvm::StringRef("Test"), 'X');
auto Values = apply_tuple(apply_variadic(), Items);
EXPECT_EQ(2, std::get<0>(Values));
EXPECT_EQ("Tes", std::get<1>(Values));
EXPECT_EQ('Y', std::get<2>(Values));
}
TEST(STLExtrasTest, CountAdaptor) {
std::vector<int> v;
v.push_back(1);
v.push_back(2);
v.push_back(1);
v.push_back(4);
v.push_back(3);
v.push_back(2);
v.push_back(1);
EXPECT_EQ(3, count(v, 1));
EXPECT_EQ(2, count(v, 2));
EXPECT_EQ(1, count(v, 3));
EXPECT_EQ(1, count(v, 4));
}
TEST(STLExtrasTest, for_each) {
std::vector<int> v{0, 1, 2, 3, 4};
int count = 0;
llvm::for_each(v, [&count](int) { ++count; });
EXPECT_EQ(5, count);
}
TEST(STLExtrasTest, ToVector) {
std::vector<char> v = {'a', 'b', 'c'};
auto Enumerated = to_vector<4>(enumerate(v));
ASSERT_EQ(3u, Enumerated.size());
for (size_t I = 0; I < v.size(); ++I) {
EXPECT_EQ(I, Enumerated[I].index());
EXPECT_EQ(v[I], Enumerated[I].value());
}
}
TEST(STLExtrasTest, ConcatRange) {
std::vector<int> Expected = {1, 2, 3, 4, 5, 6, 7, 8};
std::vector<int> Test;
std::vector<int> V1234 = {1, 2, 3, 4};
std::list<int> L56 = {5, 6};
SmallVector<int, 2> SV78 = {7, 8};
// Use concat across different sized ranges of different types with different
// iterators.
for (int &i : concat<int>(V1234, L56, SV78))
Test.push_back(i);
EXPECT_EQ(Expected, Test);
// Use concat between a temporary, an L-value, and an R-value to make sure
// complex lifetimes work well.
Test.clear();
for (int &i : concat<int>(std::vector<int>(V1234), L56, std::move(SV78)))
Test.push_back(i);
EXPECT_EQ(Expected, Test);
}
TEST(STLExtrasTest, PartitionAdaptor) {
std::vector<int> V = {1, 2, 3, 4, 5, 6, 7, 8};
auto I = partition(V, [](int i) { return i % 2 == 0; });
ASSERT_EQ(V.begin() + 4, I);
// Sort the two halves as partition may have messed with the order.
llvm::sort(V.begin(), I);
llvm::sort(I, V.end());
EXPECT_EQ(2, V[0]);
EXPECT_EQ(4, V[1]);
EXPECT_EQ(6, V[2]);
EXPECT_EQ(8, V[3]);
EXPECT_EQ(1, V[4]);
EXPECT_EQ(3, V[5]);
EXPECT_EQ(5, V[6]);
EXPECT_EQ(7, V[7]);
}
TEST(STLExtrasTest, EraseIf) {
std::vector<int> V = {1, 2, 3, 4, 5, 6, 7, 8};
erase_if(V, [](int i) { return i % 2 == 0; });
EXPECT_EQ(4u, V.size());
EXPECT_EQ(1, V[0]);
EXPECT_EQ(3, V[1]);
EXPECT_EQ(5, V[2]);
EXPECT_EQ(7, V[3]);
}
namespace some_namespace {
struct some_struct {
std::vector<int> data;
std::string swap_val;
};
std::vector<int>::const_iterator begin(const some_struct &s) {
return s.data.begin();
}
std::vector<int>::const_iterator end(const some_struct &s) {
return s.data.end();
}
void swap(some_struct &lhs, some_struct &rhs) {
// make swap visible as non-adl swap would even seem to
// work with std::swap which defaults to moving
lhs.swap_val = "lhs";
rhs.swap_val = "rhs";
}
} // namespace some_namespace
TEST(STLExtrasTest, ADLTest) {
some_namespace::some_struct s{{1, 2, 3, 4, 5}, ""};
some_namespace::some_struct s2{{2, 4, 6, 8, 10}, ""};
EXPECT_EQ(*adl_begin(s), 1);
EXPECT_EQ(*(adl_end(s) - 1), 5);
adl_swap(s, s2);
EXPECT_EQ(s.swap_val, "lhs");
EXPECT_EQ(s2.swap_val, "rhs");
int count = 0;
llvm::for_each(s, [&count](int) { ++count; });
EXPECT_EQ(5, count);
}
TEST(STLExtrasTest, EmptyTest) {
std::vector<void*> V;
EXPECT_TRUE(llvm::empty(V));
V.push_back(nullptr);
EXPECT_FALSE(llvm::empty(V));
std::initializer_list<int> E = {};
std::initializer_list<int> NotE = {7, 13, 42};
EXPECT_TRUE(llvm::empty(E));
EXPECT_FALSE(llvm::empty(NotE));
auto R0 = make_range(V.begin(), V.begin());
EXPECT_TRUE(llvm::empty(R0));
auto R1 = make_range(V.begin(), V.end());
EXPECT_FALSE(llvm::empty(R1));
}
TEST(STLExtrasTest, DropBeginTest) {
SmallVector<int, 5> vec{0, 1, 2, 3, 4};
for (int n = 0; n < 5; ++n) {
int i = n;
for (auto &v : drop_begin(vec, n)) {
EXPECT_EQ(v, i);
i += 1;
}
EXPECT_EQ(i, 5);
}
}
TEST(STLExtrasTest, EarlyIncrementTest) {
std::list<int> L = {1, 2, 3, 4};
auto EIR = make_early_inc_range(L);
auto I = EIR.begin();
auto EI = EIR.end();
EXPECT_NE(I, EI);
EXPECT_EQ(1, *I);
#if LLVM_ENABLE_ABI_BREAKING_CHECKS
#ifndef NDEBUG
// Repeated dereferences are not allowed.
EXPECT_DEATH(*I, "Cannot dereference");
// Comparison after dereference is not allowed.
EXPECT_DEATH((void)(I == EI), "Cannot compare");
EXPECT_DEATH((void)(I != EI), "Cannot compare");
#endif
#endif
++I;
EXPECT_NE(I, EI);
#if LLVM_ENABLE_ABI_BREAKING_CHECKS
#ifndef NDEBUG
// You cannot increment prior to dereference.
EXPECT_DEATH(++I, "Cannot increment");
#endif
#endif
EXPECT_EQ(2, *I);
#if LLVM_ENABLE_ABI_BREAKING_CHECKS
#ifndef NDEBUG
// Repeated dereferences are not allowed.
EXPECT_DEATH(*I, "Cannot dereference");
#endif
#endif
// Inserting shouldn't break anything. We should be able to keep dereferencing
// the currrent iterator and increment. The increment to go to the "next"
// iterator from before we inserted.
L.insert(std::next(L.begin(), 2), -1);
++I;
EXPECT_EQ(3, *I);
// Erasing the front including the current doesn't break incrementing.
L.erase(L.begin(), std::prev(L.end()));
++I;
EXPECT_EQ(4, *I);
++I;
EXPECT_EQ(EIR.end(), I);
}
TEST(STLExtrasTest, splat) {
std::vector<int> V;
EXPECT_FALSE(is_splat(V));
V.push_back(1);
EXPECT_TRUE(is_splat(V));
V.push_back(1);
V.push_back(1);
EXPECT_TRUE(is_splat(V));
V.push_back(2);
EXPECT_FALSE(is_splat(V));
}
TEST(STLExtrasTest, to_address) {
int *V1 = new int;
EXPECT_EQ(V1, to_address(V1));
// Check fancy pointer overload for unique_ptr
std::unique_ptr<int> V2 = std::make_unique<int>(0);
EXPECT_EQ(V2.get(), to_address(V2));
V2.reset(V1);
EXPECT_EQ(V1, to_address(V2));
V2.release();
// Check fancy pointer overload for shared_ptr
std::shared_ptr<int> V3 = std::make_shared<int>(0);
std::shared_ptr<int> V4 = V3;
EXPECT_EQ(V3.get(), V4.get());
EXPECT_EQ(V3.get(), to_address(V3));
EXPECT_EQ(V4.get(), to_address(V4));
V3.reset(V1);
EXPECT_EQ(V1, to_address(V3));
}
TEST(STLExtrasTest, partition_point) {
std::vector<int> V = {1, 3, 5, 7, 9};
// Range version.
EXPECT_EQ(V.begin() + 3,
partition_point(V, [](unsigned X) { return X < 7; }));
EXPECT_EQ(V.begin(), partition_point(V, [](unsigned X) { return X < 1; }));
EXPECT_EQ(V.end(), partition_point(V, [](unsigned X) { return X < 50; }));
}
TEST(STLExtrasTest, hasSingleElement) {
const std::vector<int> V0 = {}, V1 = {1}, V2 = {1, 2};
const std::vector<int> V10(10);
EXPECT_EQ(hasSingleElement(V0), false);
EXPECT_EQ(hasSingleElement(V1), true);
EXPECT_EQ(hasSingleElement(V2), false);
EXPECT_EQ(hasSingleElement(V10), false);
}
TEST(STLExtrasTest, hasNItems) {
const std::list<int> V0 = {}, V1 = {1}, V2 = {1, 2};
const std::list<int> V3 = {1, 3, 5};
EXPECT_TRUE(hasNItems(V0, 0));
EXPECT_FALSE(hasNItems(V0, 2));
EXPECT_TRUE(hasNItems(V1, 1));
EXPECT_FALSE(hasNItems(V1, 2));
EXPECT_TRUE(hasNItems(V3.begin(), V3.end(), 3, [](int x) { return x < 10; }));
EXPECT_TRUE(hasNItems(V3.begin(), V3.end(), 0, [](int x) { return x > 10; }));
EXPECT_TRUE(hasNItems(V3.begin(), V3.end(), 2, [](int x) { return x < 5; }));
}
TEST(STLExtras, hasNItemsOrMore) {
const std::list<int> V0 = {}, V1 = {1}, V2 = {1, 2};
const std::list<int> V3 = {1, 3, 5};
EXPECT_TRUE(hasNItemsOrMore(V1, 1));
EXPECT_FALSE(hasNItemsOrMore(V1, 2));
EXPECT_TRUE(hasNItemsOrMore(V2, 1));
EXPECT_TRUE(hasNItemsOrMore(V2, 2));
EXPECT_FALSE(hasNItemsOrMore(V2, 3));
EXPECT_TRUE(hasNItemsOrMore(V3, 3));
EXPECT_FALSE(hasNItemsOrMore(V3, 4));
EXPECT_TRUE(
hasNItemsOrMore(V3.begin(), V3.end(), 3, [](int x) { return x < 10; }));
EXPECT_FALSE(
hasNItemsOrMore(V3.begin(), V3.end(), 3, [](int x) { return x > 10; }));
EXPECT_TRUE(
hasNItemsOrMore(V3.begin(), V3.end(), 2, [](int x) { return x < 5; }));
}
TEST(STLExtras, hasNItemsOrLess) {
const std::list<int> V0 = {}, V1 = {1}, V2 = {1, 2};
const std::list<int> V3 = {1, 3, 5};
EXPECT_TRUE(hasNItemsOrLess(V0, 0));
EXPECT_TRUE(hasNItemsOrLess(V0, 1));
EXPECT_TRUE(hasNItemsOrLess(V0, 2));
EXPECT_FALSE(hasNItemsOrLess(V1, 0));
EXPECT_TRUE(hasNItemsOrLess(V1, 1));
EXPECT_TRUE(hasNItemsOrLess(V1, 2));
EXPECT_FALSE(hasNItemsOrLess(V2, 0));
EXPECT_FALSE(hasNItemsOrLess(V2, 1));
EXPECT_TRUE(hasNItemsOrLess(V2, 2));
EXPECT_TRUE(hasNItemsOrLess(V2, 3));
EXPECT_FALSE(hasNItemsOrLess(V3, 0));
EXPECT_FALSE(hasNItemsOrLess(V3, 1));
EXPECT_FALSE(hasNItemsOrLess(V3, 2));
EXPECT_TRUE(hasNItemsOrLess(V3, 3));
EXPECT_TRUE(hasNItemsOrLess(V3, 4));
EXPECT_TRUE(
hasNItemsOrLess(V3.begin(), V3.end(), 1, [](int x) { return x == 1; }));
EXPECT_TRUE(
hasNItemsOrLess(V3.begin(), V3.end(), 2, [](int x) { return x < 5; }));
EXPECT_TRUE(
hasNItemsOrLess(V3.begin(), V3.end(), 5, [](int x) { return x < 5; }));
EXPECT_FALSE(
hasNItemsOrLess(V3.begin(), V3.end(), 2, [](int x) { return x < 10; }));
}
TEST(STLExtras, MoveRange) {
class Foo {
bool A;
public:
Foo() : A(true) {}
Foo(const Foo &) = delete;
Foo(Foo &&Other) : A(Other.A) { Other.A = false; }
Foo &operator=(const Foo &) = delete;
Foo &operator=(Foo &&Other) {
if (this != &Other) {
A = Other.A;
Other.A = false;
}
return *this;
}
operator bool() const { return A; }
};
SmallVector<Foo, 4U> V1, V2, V3, V4;
auto HasVal = [](const Foo &Item) { return static_cast<bool>(Item); };
auto Build = [&] {
SmallVector<Foo, 4U> Foos;
Foos.resize(4U);
return Foos;
};
V1.resize(4U);
EXPECT_TRUE(llvm::all_of(V1, HasVal));
llvm::move(V1, std::back_inserter(V2));
// Ensure input container is same size, but its contents were moved out.
EXPECT_EQ(V1.size(), 4U);
EXPECT_TRUE(llvm::none_of(V1, HasVal));
// Ensure output container has the contents of the input container.
EXPECT_EQ(V2.size(), 4U);
EXPECT_TRUE(llvm::all_of(V2, HasVal));
llvm::move(std::move(V2), std::back_inserter(V3));
EXPECT_TRUE(llvm::none_of(V2, HasVal));
EXPECT_EQ(V3.size(), 4U);
EXPECT_TRUE(llvm::all_of(V3, HasVal));
llvm::move(Build(), std::back_inserter(V4));
EXPECT_EQ(V4.size(), 4U);
EXPECT_TRUE(llvm::all_of(V4, HasVal));
}
} // namespace
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