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Merged
mborland merged 3 commits into from
Feb 10, 2025
Merged

Improve and document explicit conversion saturation #851

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39067e1
Change return value on bad conversion
mborland Jan 31, 2025
21d8840
Update tests
mborland Jan 31, 2025
6492aa8
Update docs
mborland Jan 31, 2025
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2 changes: 2 additions & 0 deletions doc/decimal/decimal128.adoc
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Expand Up @@ -50,6 +50,8 @@ template <typename Integral>
constexpr decimal128& operator=(const Integeral& RHS) noexcept;

// 3.2.4.4 Conversion to integral type
// If the value exceeds the range of the integral,
// or is non-finite std::numeric_limits::max() is returned
explicit constexpr operator int() const noexcept;
explicit constexpr operator unsigned() const noexcept;
explicit constexpr operator long() const noexcept;
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2 changes: 2 additions & 0 deletions doc/decimal/decimal128_fast.adoc
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Expand Up @@ -50,6 +50,8 @@ template <typename Integral>
constexpr decimal128_fast& operator=(const Integeral& RHS) noexcept;

// 3.2.4.4 Conversion to integral type
// If the value exceeds the range of the integral,
// or is non-finite std::numeric_limits::max() is returned
explicit constexpr operator int() const noexcept;
explicit constexpr operator unsigned() const noexcept;
explicit constexpr operator long() const noexcept;
Expand Down
2 changes: 2 additions & 0 deletions doc/decimal/decimal32.adoc
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Expand Up @@ -50,6 +50,8 @@ template <typename Integral>
constexpr decimal32& operator=(const Integeral& RHS) noexcept;

// 3.2.2.4 Conversion to integral type
// If the value exceeds the range of the integral,
// or is non-finite std::numeric_limits::max() is returned
explicit constexpr operator int() const noexcept;
explicit constexpr operator unsigned() const noexcept;
explicit constexpr operator long() const noexcept;
Expand Down
2 changes: 2 additions & 0 deletions doc/decimal/decimal32_fast.adoc
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Expand Up @@ -50,6 +50,8 @@ template <typename Integral>
constexpr decimal32_fast& operator=(const Integeral& RHS) noexcept;

// 3.2.2.4 Conversion to integral type
// If the value exceeds the range of the integral,
// or is non-finite std::numeric_limits::max() is returned
explicit constexpr operator int() const noexcept;
explicit constexpr operator unsigned() const noexcept;
explicit constexpr operator long() const noexcept;
Expand Down
2 changes: 2 additions & 0 deletions doc/decimal/decimal64.adoc
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Expand Up @@ -50,6 +50,8 @@ template <typename Integral>
constexpr decimal64& operator=(const Integeral& RHS) noexcept;

// 3.2.3.4 Conversion to integral type
// If the value exceeds the range of the integral,
// or is non-finite std::numeric_limits::max() is returned
explicit constexpr operator int() const noexcept;
explicit constexpr operator unsigned() const noexcept;
explicit constexpr operator long() const noexcept;
Expand Down
2 changes: 2 additions & 0 deletions doc/decimal/decimal64_fast.adoc
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Expand Up @@ -50,6 +50,8 @@ template <typename Integral>
constexpr decimal64_fast& operator=(const Integeral& RHS) noexcept;

// 3.2.3.4 Conversion to integral type
// If the value exceeds the range of the integral,
// or is non-finite std::numeric_limits::max() is returned
explicit constexpr operator int() const noexcept;
explicit constexpr operator unsigned() const noexcept;
explicit constexpr operator long() const noexcept;
Expand Down
20 changes: 6 additions & 14 deletions include/boost/decimal/detail/to_integral.hpp
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Expand Up @@ -41,23 +41,19 @@ constexpr auto to_integral(Decimal val) noexcept
if (isnan(val))
{
errno = EINVAL;
return static_cast<TargetType>(0);
return static_cast<TargetType>(std::numeric_limits<TargetType>::max());
}
if (isinf(val) || val > max_target_type || val < min_target_type)
{
errno = ERANGE;
return static_cast<TargetType>(0);
return static_cast<TargetType>(std::numeric_limits<TargetType>::max());
}

auto result {static_cast<Conversion_Type>(val.full_significand())};
auto expval {val.biased_exponent()};
const auto abs_exp_val {detail::make_positive_unsigned(expval)};

if (abs_exp_val >= 19)
{
result = 0;
}
else if (expval > 0)
if (expval > 0)
{
result *= detail::pow10<Conversion_Type>(static_cast<Conversion_Type>(expval));
}
Expand All @@ -84,23 +80,19 @@ constexpr auto to_integral_128(Decimal val) noexcept
if (isnan(val))
{
errno = EINVAL;
return static_cast<TargetType>(UINT64_C(0));
return static_cast<TargetType>(std::numeric_limits<TargetType>::max());
}
if (isinf(val) || val > max_target_type || val < min_target_type)
{
errno = ERANGE;
return static_cast<TargetType>(UINT64_C(0));
return static_cast<TargetType>(std::numeric_limits<TargetType>::max());
}

auto sig {val.full_significand()};
auto expval {val.biased_exponent()};
const auto abs_exp_val {detail::make_positive_unsigned(expval)};

if (abs_exp_val >= 38)
{
sig = 0;
}
else if (expval > 0)
if (expval > 0)
{
sig *= detail::pow10<detail::uint128>(expval);
}
Expand Down
16 changes: 8 additions & 8 deletions test/roundtrip_decimal128.cpp
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Expand Up @@ -61,20 +61,20 @@ void test_conversion_to_integer()
else
{
// Bad conversion so we use zero
BOOST_TEST_EQ(static_cast<T>(-one), static_cast<T>(0)) && BOOST_TEST_EQ(errno, ERANGE);
BOOST_TEST_EQ(static_cast<T>(-one), std::numeric_limits<T>::max()) && BOOST_TEST_EQ(errno, ERANGE);
}

errno = 0;
BOOST_TEST_EQ(static_cast<T>(std::numeric_limits<decimal128>::infinity()), static_cast<T>(0)) && BOOST_TEST_EQ(errno, ERANGE);
BOOST_TEST_EQ(static_cast<T>(std::numeric_limits<decimal128>::infinity()), std::numeric_limits<T>::max()) && BOOST_TEST_EQ(errno, ERANGE);

errno = 0;
BOOST_TEST_EQ(static_cast<T>(-std::numeric_limits<decimal128>::infinity()), static_cast<T>(0)) && BOOST_TEST_EQ(errno, ERANGE);
BOOST_TEST_EQ(static_cast<T>(-std::numeric_limits<decimal128>::infinity()), std::numeric_limits<T>::max()) && BOOST_TEST_EQ(errno, ERANGE);

errno = 0;
BOOST_TEST_EQ(static_cast<T>(std::numeric_limits<decimal128>::quiet_NaN()), static_cast<T>(0)) && BOOST_TEST_EQ(errno, EINVAL);
BOOST_TEST_EQ(static_cast<T>(std::numeric_limits<decimal128>::quiet_NaN()), std::numeric_limits<T>::max()) && BOOST_TEST_EQ(errno, EINVAL);

errno = 0;
BOOST_TEST_EQ(static_cast<T>(std::numeric_limits<decimal128>::signaling_NaN()), static_cast<T>(0)) && BOOST_TEST_EQ(errno, EINVAL);
BOOST_TEST_EQ(static_cast<T>(std::numeric_limits<decimal128>::signaling_NaN()), std::numeric_limits<T>::max()) && BOOST_TEST_EQ(errno, EINVAL);

errno = 0;
BOOST_TEST_EQ(static_cast<T>(half), static_cast<T>(0)) && BOOST_TEST_EQ(errno, 0);
Expand All @@ -89,13 +89,13 @@ void test_conversion_to_integer()
std::mt19937_64 rng(42);
std::uniform_int_distribution<int> dist(-100, -20);
errno = 0;
BOOST_TEST_EQ(static_cast<unsigned>(decimal128(dist(rng))), static_cast<unsigned>(0)) && BOOST_TEST_EQ(errno, ERANGE);
BOOST_TEST_EQ(static_cast<unsigned>(decimal128(dist(rng))), std::numeric_limits<unsigned>::max()) && BOOST_TEST_EQ(errno, ERANGE);

errno = 0;
BOOST_TEST_EQ(static_cast<unsigned long>(decimal128(dist(rng))), static_cast<unsigned long>(0)) && BOOST_TEST_EQ(errno, ERANGE);
BOOST_TEST_EQ(static_cast<unsigned long>(decimal128(dist(rng))), std::numeric_limits<unsigned long>::max()) && BOOST_TEST_EQ(errno, ERANGE);

errno = 0;
BOOST_TEST_EQ(static_cast<unsigned long long>(decimal128(dist(rng))), static_cast<unsigned long long>(0)) && BOOST_TEST_EQ(errno, ERANGE);
BOOST_TEST_EQ(static_cast<unsigned long long>(decimal128(dist(rng))), std::numeric_limits<unsigned long long>::max()) && BOOST_TEST_EQ(errno, ERANGE);
}

template <typename T>
Expand Down
16 changes: 8 additions & 8 deletions test/roundtrip_decimal128_fast.cpp
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Expand Up @@ -61,20 +61,20 @@ void test_conversion_to_integer()
else
{
// Bad conversion so we use zero
BOOST_TEST_EQ(static_cast<T>(-one), static_cast<T>(0)) && BOOST_TEST_EQ(errno, ERANGE);
BOOST_TEST_EQ(static_cast<T>(-one), std::numeric_limits<T>::max()) && BOOST_TEST_EQ(errno, ERANGE);
}

errno = 0;
BOOST_TEST_EQ(static_cast<T>(std::numeric_limits<decimal128_fast>::infinity()), static_cast<T>(0)) && BOOST_TEST_EQ(errno, ERANGE);
BOOST_TEST_EQ(static_cast<T>(std::numeric_limits<decimal128_fast>::infinity()), std::numeric_limits<T>::max()) && BOOST_TEST_EQ(errno, ERANGE);

errno = 0;
BOOST_TEST_EQ(static_cast<T>(-std::numeric_limits<decimal128_fast>::infinity()), static_cast<T>(0)) && BOOST_TEST_EQ(errno, ERANGE);
BOOST_TEST_EQ(static_cast<T>(-std::numeric_limits<decimal128_fast>::infinity()), std::numeric_limits<T>::max()) && BOOST_TEST_EQ(errno, ERANGE);

errno = 0;
BOOST_TEST_EQ(static_cast<T>(std::numeric_limits<decimal128_fast>::quiet_NaN()), static_cast<T>(0)) && BOOST_TEST_EQ(errno, EINVAL);
BOOST_TEST_EQ(static_cast<T>(std::numeric_limits<decimal128_fast>::quiet_NaN()), std::numeric_limits<T>::max()) && BOOST_TEST_EQ(errno, EINVAL);

errno = 0;
BOOST_TEST_EQ(static_cast<T>(std::numeric_limits<decimal128_fast>::signaling_NaN()), static_cast<T>(0)) && BOOST_TEST_EQ(errno, EINVAL);
BOOST_TEST_EQ(static_cast<T>(std::numeric_limits<decimal128_fast>::signaling_NaN()), std::numeric_limits<T>::max()) && BOOST_TEST_EQ(errno, EINVAL);

errno = 0;
BOOST_TEST_EQ(static_cast<T>(half), static_cast<T>(0)) && BOOST_TEST_EQ(errno, 0);
Expand All @@ -89,13 +89,13 @@ void test_conversion_to_integer()
std::mt19937_64 rng(42);
std::uniform_int_distribution<int> dist(-100, -20);
errno = 0;
BOOST_TEST_EQ(static_cast<unsigned>(decimal128_fast(dist(rng))), static_cast<unsigned>(0)) && BOOST_TEST_EQ(errno, ERANGE);
BOOST_TEST_EQ(static_cast<unsigned>(decimal128_fast(dist(rng))), std::numeric_limits<unsigned>::max()) && BOOST_TEST_EQ(errno, ERANGE);

errno = 0;
BOOST_TEST_EQ(static_cast<unsigned long>(decimal128_fast(dist(rng))), static_cast<unsigned long>(0)) && BOOST_TEST_EQ(errno, ERANGE);
BOOST_TEST_EQ(static_cast<unsigned long>(decimal128_fast(dist(rng))), std::numeric_limits<unsigned long>::max()) && BOOST_TEST_EQ(errno, ERANGE);

errno = 0;
BOOST_TEST_EQ(static_cast<unsigned long long>(decimal128_fast(dist(rng))), static_cast<unsigned long long>(0)) && BOOST_TEST_EQ(errno, ERANGE);
BOOST_TEST_EQ(static_cast<unsigned long long>(decimal128_fast(dist(rng))), std::numeric_limits<unsigned long long>::max()) && BOOST_TEST_EQ(errno, ERANGE);
}

template <typename T>
Expand Down
16 changes: 8 additions & 8 deletions test/roundtrip_decimal32.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -54,20 +54,20 @@ void test_conversion_to_integer()
else
{
// Bad conversion so we use zero
BOOST_TEST_EQ(static_cast<T>(-one), static_cast<T>(0)) && BOOST_TEST_EQ(errno, ERANGE);
BOOST_TEST_EQ(static_cast<T>(-one), std::numeric_limits<T>::max()) && BOOST_TEST_EQ(errno, ERANGE);
}

errno = 0;
BOOST_TEST_EQ(static_cast<T>(std::numeric_limits<decimal32>::infinity()), static_cast<T>(0)) && BOOST_TEST_EQ(errno, ERANGE);
BOOST_TEST_EQ(static_cast<T>(std::numeric_limits<decimal32>::infinity()), std::numeric_limits<T>::max()) && BOOST_TEST_EQ(errno, ERANGE);

errno = 0;
BOOST_TEST_EQ(static_cast<T>(-std::numeric_limits<decimal32>::infinity()), static_cast<T>(0)) && BOOST_TEST_EQ(errno, ERANGE);
BOOST_TEST_EQ(static_cast<T>(-std::numeric_limits<decimal32>::infinity()), std::numeric_limits<T>::max()) && BOOST_TEST_EQ(errno, ERANGE);

errno = 0;
BOOST_TEST_EQ(static_cast<T>(std::numeric_limits<decimal32>::quiet_NaN()), static_cast<T>(0)) && BOOST_TEST_EQ(errno, EINVAL);
BOOST_TEST_EQ(static_cast<T>(std::numeric_limits<decimal32>::quiet_NaN()), std::numeric_limits<T>::max()) && BOOST_TEST_EQ(errno, EINVAL);

errno = 0;
BOOST_TEST_EQ(static_cast<T>(std::numeric_limits<decimal32>::signaling_NaN()), static_cast<T>(0)) && BOOST_TEST_EQ(errno, EINVAL);
BOOST_TEST_EQ(static_cast<T>(std::numeric_limits<decimal32>::signaling_NaN()), std::numeric_limits<T>::max()) && BOOST_TEST_EQ(errno, EINVAL);

errno = 0;
BOOST_TEST_EQ(static_cast<T>(half), static_cast<T>(0)) && BOOST_TEST_EQ(errno, 0);
Expand All @@ -82,13 +82,13 @@ void test_conversion_to_integer()
std::mt19937_64 rng(42);
std::uniform_int_distribution<int> dist(-100, -20);
errno = 0;
BOOST_TEST_EQ(static_cast<unsigned>(decimal32(dist(rng))), static_cast<unsigned>(0)) && BOOST_TEST_EQ(errno, ERANGE);
BOOST_TEST_EQ(static_cast<unsigned>(decimal32(dist(rng))), std::numeric_limits<unsigned>::max()) && BOOST_TEST_EQ(errno, ERANGE);

errno = 0;
BOOST_TEST_EQ(static_cast<unsigned long>(decimal32(dist(rng))), static_cast<unsigned long>(0)) && BOOST_TEST_EQ(errno, ERANGE);
BOOST_TEST_EQ(static_cast<unsigned long>(decimal32(dist(rng))), std::numeric_limits<unsigned long>::max()) && BOOST_TEST_EQ(errno, ERANGE);

errno = 0;
BOOST_TEST_EQ(static_cast<unsigned long long>(decimal32(dist(rng))), static_cast<unsigned long long>(0)) && BOOST_TEST_EQ(errno, ERANGE);
BOOST_TEST_EQ(static_cast<unsigned long long>(decimal32(dist(rng))), std::numeric_limits<unsigned long long>::max()) && BOOST_TEST_EQ(errno, ERANGE);
}

template <typename T>
Expand Down
16 changes: 8 additions & 8 deletions test/roundtrip_decimal32_fast.cpp
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Expand Up @@ -52,20 +52,20 @@ void test_conversion_to_integer()
else
{
// Bad conversion so we use zero
BOOST_TEST_EQ(static_cast<T>(-one), static_cast<T>(0)) && BOOST_TEST_EQ(errno, ERANGE);
BOOST_TEST_EQ(static_cast<T>(-one), std::numeric_limits<T>::max()) && BOOST_TEST_EQ(errno, ERANGE);
}

errno = 0;
BOOST_TEST_EQ(static_cast<T>(std::numeric_limits<decimal32_fast>::infinity()), static_cast<T>(0)) && BOOST_TEST_EQ(errno, ERANGE);
BOOST_TEST_EQ(static_cast<T>(std::numeric_limits<decimal32_fast>::infinity()), std::numeric_limits<T>::max()) && BOOST_TEST_EQ(errno, ERANGE);

errno = 0;
BOOST_TEST_EQ(static_cast<T>(-std::numeric_limits<decimal32_fast>::infinity()), static_cast<T>(0)) && BOOST_TEST_EQ(errno, ERANGE);
BOOST_TEST_EQ(static_cast<T>(-std::numeric_limits<decimal32_fast>::infinity()), std::numeric_limits<T>::max()) && BOOST_TEST_EQ(errno, ERANGE);

errno = 0;
BOOST_TEST_EQ(static_cast<T>(std::numeric_limits<decimal32_fast>::quiet_NaN()), static_cast<T>(0)) && BOOST_TEST_EQ(errno, EINVAL);
BOOST_TEST_EQ(static_cast<T>(std::numeric_limits<decimal32_fast>::quiet_NaN()), std::numeric_limits<T>::max()) && BOOST_TEST_EQ(errno, EINVAL);

errno = 0;
BOOST_TEST_EQ(static_cast<T>(std::numeric_limits<decimal32_fast>::signaling_NaN()), static_cast<T>(0)) && BOOST_TEST_EQ(errno, EINVAL);
BOOST_TEST_EQ(static_cast<T>(std::numeric_limits<decimal32_fast>::signaling_NaN()), std::numeric_limits<T>::max()) && BOOST_TEST_EQ(errno, EINVAL);

errno = 0;
BOOST_TEST_EQ(static_cast<T>(half), static_cast<T>(0)) && BOOST_TEST_EQ(errno, 0);
Expand All @@ -80,13 +80,13 @@ void test_conversion_to_integer()
std::mt19937_64 rng(42);
std::uniform_int_distribution<int> dist(-100, -20);
errno = 0;
BOOST_TEST_EQ(static_cast<unsigned>(decimal32_fast(dist(rng))), static_cast<unsigned>(0)) && BOOST_TEST_EQ(errno, ERANGE);
BOOST_TEST_EQ(static_cast<unsigned>(decimal32_fast(dist(rng))), std::numeric_limits<unsigned>::max()) && BOOST_TEST_EQ(errno, ERANGE);

errno = 0;
BOOST_TEST_EQ(static_cast<unsigned long>(decimal32_fast(dist(rng))), static_cast<unsigned long>(0)) && BOOST_TEST_EQ(errno, ERANGE);
BOOST_TEST_EQ(static_cast<unsigned long>(decimal32_fast(dist(rng))), std::numeric_limits<unsigned long>::max()) && BOOST_TEST_EQ(errno, ERANGE);

errno = 0;
BOOST_TEST_EQ(static_cast<unsigned long long>(decimal32_fast(dist(rng))), static_cast<unsigned long long>(0)) && BOOST_TEST_EQ(errno, ERANGE);
BOOST_TEST_EQ(static_cast<unsigned long long>(decimal32_fast(dist(rng))), std::numeric_limits<unsigned long long>::max()) && BOOST_TEST_EQ(errno, ERANGE);
}

template <typename T>
Expand Down
16 changes: 8 additions & 8 deletions test/roundtrip_decimal64.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -51,20 +51,20 @@ void test_conversion_to_integer()
else
{
// Bad conversion so we use zero
BOOST_TEST_EQ(static_cast<T>(-one), static_cast<T>(0)) && BOOST_TEST_EQ(errno, ERANGE);
BOOST_TEST_EQ(static_cast<T>(-one), std::numeric_limits<T>::max()) && BOOST_TEST_EQ(errno, ERANGE);
}

errno = 0;
BOOST_TEST_EQ(static_cast<T>(std::numeric_limits<decimal64>::infinity()), static_cast<T>(0)) && BOOST_TEST_EQ(errno, ERANGE);
BOOST_TEST_EQ(static_cast<T>(std::numeric_limits<decimal64>::infinity()), std::numeric_limits<T>::max()) && BOOST_TEST_EQ(errno, ERANGE);

errno = 0;
BOOST_TEST_EQ(static_cast<T>(-std::numeric_limits<decimal64>::infinity()), static_cast<T>(0)) && BOOST_TEST_EQ(errno, ERANGE);
BOOST_TEST_EQ(static_cast<T>(-std::numeric_limits<decimal64>::infinity()), std::numeric_limits<T>::max()) && BOOST_TEST_EQ(errno, ERANGE);

errno = 0;
BOOST_TEST_EQ(static_cast<T>(std::numeric_limits<decimal64>::quiet_NaN()), static_cast<T>(0)) && BOOST_TEST_EQ(errno, EINVAL);
BOOST_TEST_EQ(static_cast<T>(std::numeric_limits<decimal64>::quiet_NaN()), std::numeric_limits<T>::max()) && BOOST_TEST_EQ(errno, EINVAL);

errno = 0;
BOOST_TEST_EQ(static_cast<T>(std::numeric_limits<decimal64>::signaling_NaN()), static_cast<T>(0)) && BOOST_TEST_EQ(errno, EINVAL);
BOOST_TEST_EQ(static_cast<T>(std::numeric_limits<decimal64>::signaling_NaN()), std::numeric_limits<T>::max()) && BOOST_TEST_EQ(errno, EINVAL);

errno = 0;
BOOST_TEST_EQ(static_cast<T>(half), static_cast<T>(0)) && BOOST_TEST_EQ(errno, 0);
Expand All @@ -79,13 +79,13 @@ void test_conversion_to_integer()
std::mt19937_64 rng(42);
std::uniform_int_distribution<int> dist(-100, -20);
errno = 0;
BOOST_TEST_EQ(static_cast<unsigned>(decimal64(dist(rng))), static_cast<unsigned>(0)) && BOOST_TEST_EQ(errno, ERANGE);
BOOST_TEST_EQ(static_cast<unsigned>(decimal64(dist(rng))), std::numeric_limits<unsigned>::max()) && BOOST_TEST_EQ(errno, ERANGE);

errno = 0;
BOOST_TEST_EQ(static_cast<unsigned long>(decimal64(dist(rng))), static_cast<unsigned long>(0)) && BOOST_TEST_EQ(errno, ERANGE);
BOOST_TEST_EQ(static_cast<unsigned long>(decimal64(dist(rng))), std::numeric_limits<unsigned long>::max()) && BOOST_TEST_EQ(errno, ERANGE);

errno = 0;
BOOST_TEST_EQ(static_cast<unsigned long long>(decimal64(dist(rng))), static_cast<unsigned long long>(0)) && BOOST_TEST_EQ(errno, ERANGE);
BOOST_TEST_EQ(static_cast<unsigned long long>(decimal64(dist(rng))), std::numeric_limits<unsigned long long>::max()) && BOOST_TEST_EQ(errno, ERANGE);
}

template <typename T>
Expand Down
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