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/*
* Copyright (C) 2015 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "out.h"
#include <algorithm>
#include <gtest/gtest.h>
namespace art {
struct OutTest : public testing::Test {
// Multiplies values less than 10 by two, stores the result and returns 0.
// Returns -1 if the original value was not multiplied by two.
static int multiply_small_values_by_two(size_t args, out<int> result) {
if (args < 10) {
*result = args * 2;
return 0;
} else {
return -1;
}
}
};
extern "C" int multiply_small_values_by_two_legacy(size_t args, int* result) {
if (args < 10) {
*result = args * 2;
return 0;
} else {
return -1;
}
}
TEST_F(OutTest, TraditionalCall) {
// For calling traditional C++ functions.
int res;
EXPECT_EQ(multiply_small_values_by_two(1, outof(res)), 0);
EXPECT_EQ(2, res);
}
TEST_F(OutTest, LegacyCall) {
// For calling legacy, e.g. C-style functions.
int res2;
EXPECT_EQ(0, multiply_small_values_by_two_legacy(1, outof(res2)));
EXPECT_EQ(2, res2);
}
TEST_F(OutTest, CallFromIterator) {
// For calling a function with a parameter originating as an iterator.
std::vector<int> list = {1, 2, 3}; // NOLINT [whitespace/labels] [4]
std::vector<int>::iterator it = list.begin();
EXPECT_EQ(0, multiply_small_values_by_two(2, outof_iterator(it)));
EXPECT_EQ(4, list[0]);
}
TEST_F(OutTest, CallFromPointer) {
// For calling a function with a parameter originating as a C-pointer.
std::vector<int> list = {1, 2, 3}; // NOLINT [whitespace/labels] [4]
int* list_ptr = &list[2]; // 3
EXPECT_EQ(0, multiply_small_values_by_two(2, outof_ptr(list_ptr)));
EXPECT_EQ(4, list[2]);
}
TEST_F(OutTest, OutAsIterator) {
// For using the out<T> parameter as an iterator inside of the callee.
std::vector<int> list;
int x = 100;
out<int> out_from_x = outof(x);
for (const int& val : out_from_x) {
list.push_back(val);
}
ASSERT_EQ(1u, list.size());
EXPECT_EQ(100, list[0]);
// A more typical use-case would be to use std algorithms
EXPECT_NE(out_from_x.end(),
std::find(out_from_x.begin(),
out_from_x.end(),
100)); // Search for '100' in out.
}
} // namespace art
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