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memory: added constexpr function next_power_of_two

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This commit is contained in:
Michele Caini
2021-10-07 16:53:22 +02:00
parent c538067544
commit 3144cfafd5
2 changed files with 44 additions and 1 deletions
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test/entt/core/memory.cpp
+23 -1
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@@ -1,3 +1,4 @@
#include <cmath>
#include <memory>
#include <gtest/gtest.h>
#include <entt/core/memory.hpp>
@@ -33,7 +34,10 @@ TEST(Memory, PoccaPocmaAndPocs) {
}
TEST(Memory, IsPowerOfTwo) {
ASSERT_FALSE(entt::is_power_of_two(0u));
// constexpr-ness guaranteed
constexpr auto zero_is_power_of_two = entt::is_power_of_two(0u);
ASSERT_FALSE(zero_is_power_of_two);
ASSERT_TRUE(entt::is_power_of_two(1u));
ASSERT_TRUE(entt::is_power_of_two(2u));
ASSERT_TRUE(entt::is_power_of_two(4u));
@@ -42,6 +46,24 @@ TEST(Memory, IsPowerOfTwo) {
ASSERT_FALSE(entt::is_power_of_two(200u));
}
TEST(Memory, NextPowerOfTwo) {
// constexpr-ness guaranteed
constexpr auto next_power_of_two_of_zero = entt::next_power_of_two(0u);
ASSERT_EQ(next_power_of_two_of_zero, 1u);
ASSERT_EQ(entt::next_power_of_two(1u), 2u);
ASSERT_EQ(entt::next_power_of_two(17u), 32u);
ASSERT_EQ(entt::next_power_of_two(32u), 64u);
ASSERT_EQ(entt::next_power_of_two(32u), 64u);
if constexpr(sizeof(std::size_t) > sizeof(std::uint32_t)) {
ASSERT_EQ(entt::next_power_of_two(std::pow(2, 32)), std::pow(2, 33));
ASSERT_EQ(entt::next_power_of_two(std::pow(2, 64)), 0u);
} else {
ASSERT_EQ(entt::next_power_of_two(std::pow(2, 32)), 0u);
}
}
TEST(Memory, FastMod) {
ASSERT_EQ(entt::fast_mod<8u>(0u), 0u);
ASSERT_EQ(entt::fast_mod<8u>(7u), 7u);