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boost_algorithm/test/is_clamped_test.cpp
Ivan Matek 9031f17bb8 update CR
2021-09-13 00:22:03 +02:00

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// (C) Copyright Ivan Matek, Marshall Clow 2021.
// Use, modification and distribution are subject to the
// Boost Software License, Version 1.0. (See accompanying file
// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
#include <boost/algorithm/is_clamped.hpp>
#include <boost/algorithm/clamp.hpp>
#include <cmath>
#include <cstdint>
#ifdef __cpp_impl_three_way_comparison
#if __has_include(<compare>)
#define BOOST_IS_CLAMPED_TEST_SPACESHIP
#endif
#ifdef BOOST_IS_CLAMPED_TEST_SPACESHIP
#include <compare>
#endif
#endif
#include <limits>
#include <string>
#include <tuple>
#define BOOST_TEST_MAIN
#include <boost/test/unit_test.hpp>
namespace ba = boost::algorithm;
BOOST_CONSTEXPR bool intGreater(int lhs, int rhs) { return lhs > rhs; }
class custom {
public:
custom(int x) : v(x) {}
custom(const custom &rhs) : v(rhs.v) {}
bool operator<(const custom &rhs) const { return v < rhs.v; }
bool operator==(const custom &rhs) const {
return v == rhs.v;
} // need this for the test
int v;
};
static bool customLess(const custom &lhs, const custom &rhs) { return lhs.v < rhs.v; }
void test_ints() {
// Inside the range, equal to the endpoints, and outside the endpoints.
BOOST_CHECK_EQUAL ( true, ba::is_clamped ( 3, 1, 6 ));
BOOST_CHECK_EQUAL ( true, ba::is_clamped ( 1, 1, 6 ));
BOOST_CHECK_EQUAL ( true, ba::is_clamped ( 6, 1, 6 ));
BOOST_CHECK_EQUAL ( false, ba::is_clamped ( 0, 1, 6 ));
BOOST_CHECK_EQUAL ( false, ba::is_clamped ( 7, 1, 6 ));
BOOST_CHECK_EQUAL ( true, ba::is_clamped ( 3, 6, 1, intGreater ));
BOOST_CHECK_EQUAL ( true, ba::is_clamped ( 1, 6, 1, intGreater ));
BOOST_CHECK_EQUAL ( true, ba::is_clamped ( 6, 6, 1, intGreater ));
BOOST_CHECK_EQUAL ( false, ba::is_clamped ( 0, 6, 1, intGreater ));
BOOST_CHECK_EQUAL ( false, ba::is_clamped ( 7, 6, 1, intGreater ));
// Negative numbers
BOOST_CHECK_EQUAL ( true, ba::is_clamped ( -3, -6, -1 ));
BOOST_CHECK_EQUAL ( true, ba::is_clamped ( -1, -6, -1 ));
BOOST_CHECK_EQUAL ( true, ba::is_clamped ( -6, -6, -1 ));
BOOST_CHECK_EQUAL ( false, ba::is_clamped ( 0, -6, -1 ));
BOOST_CHECK_EQUAL ( false, ba::is_clamped ( -7, -6, -1 ));
// Mixed positive and negative numbers
BOOST_CHECK_EQUAL ( true, ba::is_clamped ( 1, -5, 5 ));
BOOST_CHECK_EQUAL ( true, ba::is_clamped ( -5, -5, 5 ));
BOOST_CHECK_EQUAL ( true, ba::is_clamped ( 5, -5, 5 ));
BOOST_CHECK_EQUAL ( false, ba::is_clamped ( -6, -5, 5 ));
BOOST_CHECK_EQUAL ( false, ba::is_clamped ( 6, -5, 5 ));
// Unsigned
BOOST_CHECK_EQUAL ( true, ba::is_clamped ( 5U, 1U, 6U ));
BOOST_CHECK_EQUAL ( true, ba::is_clamped ( 1U, 1U, 6U ));
BOOST_CHECK_EQUAL ( true, ba::is_clamped ( 6U, 1U, 6U ));
BOOST_CHECK_EQUAL ( false, ba::is_clamped ( 0U, 1U, 6U ));
BOOST_CHECK_EQUAL ( false, ba::is_clamped ( 8U, 1U, 6U ));
// Mixed (1)
BOOST_CHECK_EQUAL ( true, ba::is_clamped ( 5U, 1, 6 ));
BOOST_CHECK_EQUAL ( true, ba::is_clamped ( 1U, 1, 6 ));
BOOST_CHECK_EQUAL ( true, ba::is_clamped ( 6U, 1, 6 ));
BOOST_CHECK_EQUAL ( false, ba::is_clamped ( 0U, 1, 6 ));
BOOST_CHECK_EQUAL ( false, ba::is_clamped ( 8U, 1, 6 ));
// Mixed (2)
BOOST_CHECK_EQUAL ( true, ba::is_clamped ( 5U, 1, 6. ));
BOOST_CHECK_EQUAL ( true, ba::is_clamped ( 1U, 1, 6. ));
BOOST_CHECK_EQUAL ( true, ba::is_clamped ( 6U, 1, 6. ));
BOOST_CHECK_EQUAL ( false, ba::is_clamped ( 0U, 1, 6. ));
BOOST_CHECK_EQUAL ( false, ba::is_clamped ( 8U, 1, 6. ));
// float->short conversion does not round
BOOST_CHECK_EQUAL ( true, ba::is_clamped ( 50, 50.999, 100 ));
BOOST_CHECK_EQUAL ( false, ba::is_clamped ( 50, 51.001, 100 ));
}
void test_floats() {
// If floats are IEEE754 certain floats have exact representations.
if (std::numeric_limits<float>::is_iec559) {
const float lo = 0.125;
const float hi = 0.625;
BOOST_CHECK_EQUAL ( true, ba::is_clamped ( lo, lo, hi ));
BOOST_CHECK_EQUAL ( true, ba::is_clamped ( hi, lo, hi ));
BOOST_CHECK_EQUAL ( true, ba::is_clamped ( lo + 0.01, lo, hi ));
BOOST_CHECK_EQUAL ( false, ba::is_clamped ( lo - 0.01, lo, hi ));
BOOST_CHECK_EQUAL ( false, ba::is_clamped ( hi + 0.01, lo, hi ));
// If we have nextafterf we can be more precise.
#if __cplusplus >= 201103L
assert(lo < hi);
BOOST_CHECK_EQUAL ( true, ba::is_clamped ( hi, lo, hi ));
BOOST_CHECK_EQUAL ( true, ba::is_clamped ( std::nextafterf( lo, hi ), lo, hi ));
BOOST_CHECK_EQUAL ( true, ba::is_clamped ( std::nextafterf( hi, lo ), lo, hi ));
BOOST_CHECK_EQUAL ( true, ba::is_clamped ( (lo + hi) / 2, lo, hi ));
// 1.0 is just for direction of nextafterf, value of 1.0 is not significant.
BOOST_CHECK_EQUAL ( false, ba::is_clamped ( std::nextafterf( lo, lo - 1.0f ), lo, hi ));
BOOST_CHECK_EQUAL ( false, ba::is_clamped ( std::nextafterf( hi, hi + 1.0f ), lo, hi ));
#endif
}
}
void test_std_string() {
BOOST_CHECK_EQUAL ( true, ba::is_clamped ( std::string("a3"), std::string("a1"), std::string("a6") ));
BOOST_CHECK_EQUAL ( true, ba::is_clamped ( std::string("a1"), std::string("a1"), std::string("a6") ));
BOOST_CHECK_EQUAL ( true, ba::is_clamped ( std::string("a6"), std::string("a1"), std::string("a6") ));
BOOST_CHECK_EQUAL ( false, ba::is_clamped ( std::string("a7"), std::string("a1"), std::string("a6") ));
BOOST_CHECK_EQUAL ( false, ba::is_clamped ( std::string("a0"), std::string("a1"), std::string("a6") ));
}
void test_custom() {
// Inside the range, equal to the endpoints, and outside the endpoints.
const custom c0(0);
const custom c1(1);
const custom c3(3);
const custom c6(6);
const custom c7(7);
BOOST_CHECK_EQUAL ( true, ba::is_clamped ( c3, c1, c6 ));
BOOST_CHECK_EQUAL ( true, ba::is_clamped ( c1, c1, c6 ));
BOOST_CHECK_EQUAL ( true, ba::is_clamped ( c6, c1, c6 ));
BOOST_CHECK_EQUAL ( false, ba::is_clamped ( c0, c1, c6 ));
BOOST_CHECK_EQUAL ( false, ba::is_clamped ( c7, c1, c6 ));
BOOST_CHECK_EQUAL ( true, ba::is_clamped ( c3, c1, c6, customLess ));
BOOST_CHECK_EQUAL ( true, ba::is_clamped ( c1, c1, c6, customLess ));
BOOST_CHECK_EQUAL ( true, ba::is_clamped ( c6, c1, c6, customLess ));
BOOST_CHECK_EQUAL ( false, ba::is_clamped ( c0, c1, c6, customLess ));
BOOST_CHECK_EQUAL ( false, ba::is_clamped ( c7, c1, c6, customLess ));
}
void test_point_interval() {
BOOST_CHECK_EQUAL(true, ba::is_clamped(1, 1, 1));
BOOST_CHECK_EQUAL(false, ba::is_clamped(0, 1, 1));
BOOST_CHECK_EQUAL(false, ba::is_clamped(2, 1, 1));
}
void test_first_argument_determines_types() {
// all arguments are int
BOOST_CHECK_EQUAL(true, ba::is_clamped(5, 5.9, 6.1));
BOOST_CHECK_EQUAL(true, ba::is_clamped(6, 5.9, 6.1));
// all arguments are double
BOOST_CHECK_EQUAL(false, ba::is_clamped(5.0, 5.9, 6.1));
BOOST_CHECK_EQUAL(false, ba::is_clamped(6.2, 5.9, 6.1));
}
void test_constexpr() {
#if __cplusplus >= 201402L
{
constexpr bool is_clamped = (ba::is_clamped ( 3, 1, 6 ));
BOOST_CHECK_EQUAL (true, is_clamped );
}
{
constexpr bool is_clamped = (ba::is_clamped ( 1, 1, 6 ));
BOOST_CHECK_EQUAL (true, is_clamped );
}
{
constexpr bool is_clamped = (ba::is_clamped ( 6, 1, 6 ));
BOOST_CHECK_EQUAL (true, is_clamped );
}
{
constexpr bool is_clamped = (ba::is_clamped ( 0, 1, 6 ));
BOOST_CHECK_EQUAL(false, is_clamped );
}
{
constexpr bool is_clamped = (ba::is_clamped ( 7, 1, 6 ));
BOOST_CHECK_EQUAL(false, is_clamped );
}
#endif
}
#ifdef BOOST_IS_CLAMPED_TEST_SPACESHIP
struct custom_with_spaceship {
int v;
auto operator<=>(const custom_with_spaceship&) const = default;
};
#endif
void test_spaceship() {
#ifdef BOOST_IS_CLAMPED_TEST_SPACESHIP
// Inside the range, equal to the endpoints, and outside the endpoints.
const custom_with_spaceship c0(0);
const custom_with_spaceship c1(1);
const custom_with_spaceship c3(3);
const custom_with_spaceship c6(6);
const custom_with_spaceship c7(7);
BOOST_CHECK_EQUAL ( true, ba::is_clamped (c3, c1, c6 ));
BOOST_CHECK_EQUAL ( true, ba::is_clamped (c1, c1, c6 ));
BOOST_CHECK_EQUAL ( true, ba::is_clamped (c6, c1, c6 ));
BOOST_CHECK_EQUAL ( false, ba::is_clamped (c0, c1, c6 ));
BOOST_CHECK_EQUAL ( false, ba::is_clamped (c7, c1, c6 ));
{
constexpr custom_with_spaceship c1(1);
constexpr custom_with_spaceship c3(3);
constexpr custom_with_spaceship c6(6);
constexpr bool clamped = ba::is_clamped (c3, c1, c6 );
BOOST_CHECK_EQUAL ( true, clamped );
}
#endif
}
BOOST_AUTO_TEST_CASE(test_main) {
test_ints();
test_floats();
test_std_string();
test_custom();
test_point_interval();
test_first_argument_determines_types();
test_constexpr();
test_spaceship();
}
#if __cplusplus >= 201103L
typedef std::tuple<std::uint8_t, std::int8_t, std::uint16_t, std::int16_t,
std::int32_t, std::uint32_t, std::int64_t, std::uint64_t> test_types_tuple;
BOOST_AUTO_TEST_CASE_TEMPLATE(test_extremes, T, test_types_tuple) {
const T max = std::numeric_limits<T>::max();
BOOST_CHECK_EQUAL(true, ba::is_clamped( max, max, max ));
BOOST_CHECK_EQUAL(true, ba::is_clamped( max, max - 1, max ));
BOOST_CHECK_EQUAL(false, ba::is_clamped( max - 1, max, max ));
const T min = std::numeric_limits<T>::min();
BOOST_CHECK_EQUAL(true, ba::is_clamped( min, min, min ));
BOOST_CHECK_EQUAL(true, ba::is_clamped( min, min, min + 1 ));
BOOST_CHECK_EQUAL(false, ba::is_clamped( min, min + 1, min + 1 ));
}
#endif
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