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Throw exception if floor2 and ceil2 are misused

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This commit is contained in:
Tulio Leao
2019-12-03 23:13:12 -03:00
parent c4089acd63
commit aa02a8c7ce
1 changed files with 5 additions and 2 deletions
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7
src/openrct2/common.h
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@@ -25,6 +25,7 @@
#include <cassert>
#include <cstddef>
#include <cstdint>
#include <stdexcept>
using namespace Numerics;
@@ -58,14 +59,16 @@ constexpr bool is_power_of_2(int v)
// Rounds an integer down to the given power of 2. y must be a power of 2.
constexpr int floor2(const int x, const int y)
{
assert(is_power_of_2(y));
if (!is_power_of_2(y))
throw std::logic_error("floor2 should only operate on power of 2");
return x & ~(y - 1);
}
// Rounds an integer up to the given power of 2. y must be a power of 2.
constexpr int ceil2(const int x, const int y)
{
assert(is_power_of_2(y));
if (!is_power_of_2(y))
throw std::logic_error("ceil2 should only operate on power of 2");
return (x + y - 1) & ~(y - 1);
}