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list utils: implementation of first_of

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This commit is contained in:
Moritz Bunkus 2015-06-06 15:40:16 +02:00
parent d5920630bd
commit 6f80025fe6
2 changed files with 33 additions and 0 deletions
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18
src/common/list_utils.h
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@ -14,6 +14,8 @@
#ifndef MTX_COMMON_LIST_UTILS_H #ifndef MTX_COMMON_LIST_UTILS_H
#define MTX_COMMON_LIST_UTILS_H #define MTX_COMMON_LIST_UTILS_H
#include <boost/optional.hpp>
namespace mtx { namespace mtx {
template<typename T> template<typename T>
@ -73,6 +75,22 @@ none_of(std::function<bool(T const &)> pred,
return !any_of<T, Trest...>(pred, val, rest...); return !any_of<T, Trest...>(pred, val, rest...);
} }
template<typename T>
boost::optional<T>
first_of(std::function<bool(T const &)> pred,
T const &val) {
return pred(val) ? val : boost::optional<T>{};
}
template<typename T,
typename... Trest>
boost::optional<T>
first_of(std::function<bool(T const &)> pred,
T const &val,
Trest... rest) {
return pred(val) ? val : first_of(pred, rest...);
}
} }
#endif // MTX_COMMON_LIST_UTILS_H #endif // MTX_COMMON_LIST_UTILS_H

15
tests/unit/common/list_utils.cpp
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@ -6,6 +6,21 @@
namespace { namespace {
TEST(ListUtils, first_of) {
EXPECT_FALSE(mtx::first_of<int>([](int val) { return val > 43; }, 42));
EXPECT_TRUE(!!mtx::first_of<int>([](int val) { return val > 43; }, 48));
EXPECT_TRUE(!!mtx::first_of<int>([](int val) { return val > 43; }, 42, 54));
EXPECT_TRUE(!!mtx::first_of<int>([](int val) { return val > 43; }, 42, 41, 40, 39, 38, 12345));
EXPECT_EQ(48, mtx::first_of<int>([](int val) { return val > 43; }, 48));
EXPECT_EQ(54, mtx::first_of<int>([](int val) { return val > 43; }, 42, 54).get());
EXPECT_EQ(12345, mtx::first_of<int>([](int val) { return val > 43; }, 42, 41, 40, 39, 38, 12345).get());
EXPECT_TRUE(!!mtx::first_of<void *>([](void *p) { return !!p; }, static_cast<void *>(nullptr), reinterpret_cast<void *>(0x12345)));
EXPECT_EQ(reinterpret_cast<void *>(0x12345), mtx::first_of<void *>([](void *p) { return !!p; }, static_cast<void *>(nullptr), reinterpret_cast<void *>(0x12345)));
}
TEST(ListUtils, included_in) { TEST(ListUtils, included_in) {
EXPECT_TRUE(mtx::included_in(42, 42)); EXPECT_TRUE(mtx::included_in(42, 42));
EXPECT_TRUE(mtx::included_in(42, 54, 42, 48)); EXPECT_TRUE(mtx::included_in(42, 54, 42, 48));