1 | /* |
2 | * Copyright 2016-present Facebook, Inc. |
3 | * |
4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
5 | * you may not use this file except in compliance with the License. |
6 | * You may obtain a copy of the License at |
7 | * |
8 | * http://www.apache.org/licenses/LICENSE-2.0 |
9 | * |
10 | * Unless required by applicable law or agreed to in writing, software |
11 | * distributed under the License is distributed on an "AS IS" BASIS, |
12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
13 | * See the License for the specific language governing permissions and |
14 | * limitations under the License. |
15 | */ |
16 | |
17 | #include <folly/portability/Constexpr.h> |
18 | |
19 | #include <folly/portability/GTest.h> |
20 | |
21 | using folly::constexpr_strcmp; |
22 | |
23 | TEST(ConstexprTest, constexpr_strlen_cstr) { |
24 | constexpr auto v = "hello" ; |
25 | constexpr auto a = folly::constexpr_strlen(v); |
26 | EXPECT_EQ(5, a); |
27 | EXPECT_TRUE((std::is_same<const size_t, decltype(a)>::value)); |
28 | } |
29 | |
30 | // gcc-4.9 cannot compile the following constexpr code correctly |
31 | #if !(defined(__GNUC__) && !defined(__clang__) && __GNUC__ < 5) |
32 | TEST(ConstexprTest, constexpr_strlen_ints) { |
33 | constexpr int v[] = {5, 3, 4, 0, 7}; |
34 | constexpr auto a = folly::constexpr_strlen(v); |
35 | EXPECT_EQ(3, a); |
36 | EXPECT_TRUE((std::is_same<const size_t, decltype(a)>::value)); |
37 | } |
38 | |
39 | TEST(ConstexprTest, constexpr_strcmp_ints) { |
40 | constexpr int v[] = {5, 3, 4, 0, 7}; |
41 | constexpr int v1[] = {6, 4}; |
42 | static_assert(constexpr_strcmp(v1, v) > 0, "constexpr_strcmp is broken" ); |
43 | static_assert(constexpr_strcmp(v, v) == 0, "constexpr_strcmp is broken" ); |
44 | } |
45 | #endif |
46 | |
47 | static_assert( |
48 | constexpr_strcmp("abc" , "abc" ) == 0, |
49 | "constexpr_strcmp is broken" ); |
50 | static_assert(constexpr_strcmp("" , "" ) == 0, "constexpr_strcmp is broken" ); |
51 | static_assert(constexpr_strcmp("abc" , "def" ) < 0, "constexpr_strcmp is broken" ); |
52 | static_assert(constexpr_strcmp("xyz" , "abc" ) > 0, "constexpr_strcmp is broken" ); |
53 | static_assert(constexpr_strcmp("a" , "abc" ) < 0, "constexpr_strcmp is broken" ); |
54 | static_assert(constexpr_strcmp("abc" , "a" ) > 0, "constexpr_strcmp is broken" ); |
55 | |