/*
- * Copyright 2015 Facebook, Inc.
+ * Copyright 2017 Facebook, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
#include <folly/MapUtil.h>
+#include <cstddef>
#include <map>
-#include <gtest/gtest.h>
+#include <unordered_map>
+
+#include <folly/Traits.h>
+#include <folly/portability/GTest.h>
using namespace folly;
EXPECT_EQ(0, get_default(m, 3));
}
+TEST(MapUtil, get_default_function) {
+ std::map<int, int> m;
+ m[1] = 2;
+ EXPECT_EQ(2, get_default(m, 1, [] { return 42; }));
+ EXPECT_EQ(42, get_default(m, 2, [] { return 42; }));
+ EXPECT_EQ(0, get_default(m, 3));
+}
+
TEST(MapUtil, get_or_throw) {
std::map<int, int> m;
m[1] = 2;
EXPECT_EQ(2, get_or_throw(m, 1));
EXPECT_THROW(get_or_throw(m, 2), std::out_of_range);
+ EXPECT_EQ(&m[1], &get_or_throw(m, 1));
+ get_or_throw(m, 1) = 3;
+ EXPECT_EQ(3, get_or_throw(m, 1));
+ const auto& cm = m;
+ EXPECT_EQ(&m[1], &get_or_throw(cm, 1));
+ EXPECT_EQ(3, get_or_throw(cm, 1));
+ EXPECT_THROW(get_or_throw(cm, 2), std::out_of_range);
}
TEST(MapUtil, get_or_throw_specified) {
TEST(MapUtil, get_optional) {
std::map<int, int> m;
m[1] = 2;
- EXPECT_TRUE(get_optional(m, 1));
+ EXPECT_TRUE(get_optional(m, 1).hasValue());
EXPECT_EQ(2, get_optional(m, 1).value());
- EXPECT_FALSE(get_optional(m, 2));
+ EXPECT_FALSE(get_optional(m, 2).hasValue());
}
TEST(MapUtil, get_ref_default) {
const int i = 42;
EXPECT_EQ(2, get_ref_default(m, 1, i));
EXPECT_EQ(42, get_ref_default(m, 2, i));
+ EXPECT_EQ(std::addressof(i), std::addressof(get_ref_default(m, 2, i)));
+}
+
+TEST(MapUtil, get_ref_default_function) {
+ std::map<int, int> m;
+ m[1] = 2;
+ const int i = 42;
+ EXPECT_EQ(2, get_ref_default(m, 1, [&i]() -> const int& { return i; }));
+ EXPECT_EQ(42, get_ref_default(m, 2, [&i]() -> const int& { return i; }));
+ EXPECT_EQ(
+ std::addressof(i),
+ std::addressof(
+ get_ref_default(m, 2, [&i]() -> const int& { return i; })));
+ // statically disallowed:
+ // get_ref_default(m, 2, [] { return 7; });
}
TEST(MapUtil, get_ptr) {
*get_ptr(m, 1) = 4;
EXPECT_EQ(4, m.at(1));
}
+
+TEST(MapUtil, get_ptr_path_simple) {
+ using std::map;
+ map<int, map<int, map<int, map<int, int>>>> m{{1, {{2, {{3, {{4, 5}}}}}}}};
+ EXPECT_EQ(5, *get_ptr(m, 1, 2, 3, 4));
+ EXPECT_TRUE(get_ptr(m, 1, 2, 3, 4));
+ EXPECT_FALSE(get_ptr(m, 1, 2, 3, 0));
+ EXPECT_TRUE(get_ptr(m, 1, 2, 3));
+ EXPECT_FALSE(get_ptr(m, 1, 2, 0));
+ EXPECT_TRUE(get_ptr(m, 1, 2));
+ EXPECT_FALSE(get_ptr(m, 1, 0));
+ EXPECT_TRUE(get_ptr(m, 1));
+ EXPECT_FALSE(get_ptr(m, 0));
+ const auto& cm = m;
+ ++*get_ptr(m, 1, 2, 3, 4);
+ EXPECT_EQ(6, *get_ptr(cm, 1, 2, 3, 4));
+ EXPECT_TRUE(get_ptr(cm, 1, 2, 3, 4));
+ EXPECT_FALSE(get_ptr(cm, 1, 2, 3, 0));
+}
+
+TEST(MapUtil, get_ptr_path_mixed) {
+ using std::map;
+ using std::unordered_map;
+ using std::string;
+ unordered_map<string, map<int, map<string, int>>> m{{"a", {{1, {{"b", 7}}}}}};
+ EXPECT_EQ(7, *get_ptr(m, "a", 1, "b"));
+ EXPECT_TRUE(get_ptr(m, "a", 1, "b"));
+ EXPECT_FALSE(get_ptr(m, "b", 1, "b"));
+ EXPECT_FALSE(get_ptr(m, "a", 2, "b"));
+ EXPECT_FALSE(get_ptr(m, "a", 1, "c"));
+ EXPECT_TRUE(get_ptr(m, "a", 1, "b"));
+ EXPECT_TRUE(get_ptr(m, "a", 1));
+ EXPECT_TRUE(get_ptr(m, "a"));
+ const auto& cm = m;
+ ++*get_ptr(m, "a", 1, "b");
+ EXPECT_EQ(8, *get_ptr(cm, "a", 1, "b"));
+ EXPECT_TRUE(get_ptr(cm, "a", 1, "b"));
+ EXPECT_FALSE(get_ptr(cm, "b", 1, "b"));
+}
+
+namespace {
+template <typename T>
+struct element_type {
+ using type = typename std::decay<T>::type;
+};
+
+template <typename T>
+struct element_type<T()> {
+ using type = T;
+};
+
+template <typename T>
+using element_type_t = typename element_type<T>::type;
+
+template <typename T, typename = void>
+struct Compiles : std::false_type {};
+
+template <typename T>
+struct Compiles<
+ T,
+ void_t<decltype(get_ref_default(
+ std::declval<std::map<int, element_type_t<T>>>(),
+ std::declval<int>(),
+ std::declval<T>()))>> : std::true_type {};
+} // namespace
+
+TEST(MapUtil, get_default_temporary) {
+ EXPECT_TRUE(Compiles<const int&>::value);
+ EXPECT_TRUE(Compiles<int&>::value);
+ EXPECT_FALSE(Compiles<const int&&>::value);
+ EXPECT_FALSE(Compiles<int&&>::value);
+
+ EXPECT_TRUE(Compiles<const int&()>::value);
+ EXPECT_TRUE(Compiles<int&()>::value);
+ EXPECT_FALSE(Compiles<int()>::value);
+}
+
+TEST(MapUtil, get_default_path) {
+ using std::map;
+ map<int, map<int, int>> m;
+ m[4][2] = 42;
+ EXPECT_EQ(42, get_default(m, 4, 2, 42));
+ EXPECT_EQ(42, get_default(m, 1, 3, 42));
+}
+
+TEST(MapUtil, get_default_path_mixed) {
+ using std::map;
+ using std::unordered_map;
+ using std::string;
+ map<int, unordered_map<string, StringPiece>> m;
+ int key1 = 42;
+ const string key2 = "hello";
+ constexpr StringPiece value = "world";
+ constexpr StringPiece dflt = "default";
+ m[key1][key2] = value;
+ EXPECT_EQ(value, get_default(m, 42, key2, dflt));
+ EXPECT_EQ(value, get_default(m, key1, "hello", dflt));
+ EXPECT_EQ(dflt, get_default(m, 0, key2, dflt));
+ EXPECT_EQ(dflt, get_default(m, key1, "bad", "default"));
+}
+
+TEST(MapUtil, get_ref_default_path) {
+ using std::map;
+ map<int, map<int, int>> m;
+ m[4][2] = 42;
+ const int dflt = 13;
+ EXPECT_EQ(42, get_ref_default(m, 4, 2, dflt));
+ EXPECT_EQ(dflt, get_ref_default(m, 1, 3, dflt));
+}
+
+TEST(MapUtil, get_ref_default_path_mixed) {
+ using std::map;
+ using std::unordered_map;
+ using std::string;
+ map<int, unordered_map<string, StringPiece>> m;
+ int key1 = 42;
+ const string key2 = "hello";
+ constexpr StringPiece value = "world";
+ constexpr StringPiece dflt = "default";
+ m[key1][key2] = value;
+ EXPECT_EQ(value, get_ref_default(m, 42, key2, dflt));
+ EXPECT_EQ(value, get_ref_default(m, key1, "hello", dflt));
+ EXPECT_EQ(dflt, get_ref_default(m, 0, key2, dflt));
+ EXPECT_EQ(dflt, get_ref_default(m, key1, "bad", dflt));
+}
+
+namespace {
+template <typename T, typename = void>
+struct GetRefDefaultPathCompiles : std::false_type {};
+
+template <typename T>
+struct GetRefDefaultPathCompiles<
+ T,
+ void_t<decltype(get_ref_default(
+ std::declval<std::map<int, std::map<int, element_type_t<T>>>>(),
+ std::declval<int>(),
+ std::declval<int>(),
+ std::declval<T>()))>> : std::true_type {};
+} // namespace
+
+TEST(MapUtil, get_ref_default_path_temporary) {
+ EXPECT_TRUE(GetRefDefaultPathCompiles<const int&>::value);
+ EXPECT_TRUE(GetRefDefaultPathCompiles<int&>::value);
+ EXPECT_FALSE(GetRefDefaultPathCompiles<const int&&>::value);
+ EXPECT_FALSE(GetRefDefaultPathCompiles<int&&>::value);
+}
+
+namespace {
+
+class TestConstruction {
+ public:
+ TestConstruction() {
+ EXPECT_TRUE(false);
+ }
+ TestConstruction(TestConstruction&&) {
+ EXPECT_TRUE(false);
+ }
+ TestConstruction(const TestConstruction&) {
+ EXPECT_TRUE(false);
+ }
+
+ explicit TestConstruction(std::string&& string)
+ : string_{std::move(string)} {}
+ explicit TestConstruction(int&& integer) : integer_{integer} {}
+
+ TestConstruction& operator=(const TestConstruction&) = delete;
+ TestConstruction& operator=(TestConstruction&&) = delete;
+
+ int integer_{};
+ std::string string_{};
+};
+
+} // namespace
+
+TEST(MapUtil, test_get_default_deferred_construction) {
+ auto map = std::unordered_map<int, TestConstruction>{};
+ map.emplace(
+ std::piecewise_construct,
+ std::forward_as_tuple(1),
+ std::forward_as_tuple(1));
+
+ EXPECT_EQ(map.at(1).integer_, 1);
+
+ {
+ auto val = get_default(map, 0, 1);
+ EXPECT_EQ(val.integer_, 1);
+ EXPECT_EQ(val.string_, "");
+ }
+
+ {
+ auto val = get_default(map, 0, "something");
+ EXPECT_EQ(val.integer_, 0);
+ EXPECT_EQ(val.string_, "something");
+ }
+}
projects / folly.git / blobdiff