forked from mpusz/mp-units
205 lines
9.3 KiB
C++
205 lines
9.3 KiB
C++
// The MIT License (MIT)
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//
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// Copyright (c) 2018 Mateusz Pusz
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in all
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// copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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// SOFTWARE.
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#include "units/physical/si/base/length.h"
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#include <ostream>
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namespace {
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/**
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* @brief Representation type meeting minimum requirements
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*
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* This type with a default Mode = 0 provides the minimum set of requirements to
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* satisfy @c QuantityValue concept which is used for quantity's representation type.
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*
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* In case of Mode != 0 only one of mandatory operation is removed which should
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* result in @c QuantityValue concept not being satisfied.
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*
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* @tparam Mode a flag to disable specific type's operations
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*/
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template<int Mode = 0>
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class min_expl {
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std::intmax_t value_;
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public:
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// default construction
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min_expl() requires (Mode != 1) = default;
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// construction from std::int64_t
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explicit constexpr min_expl(std::intmax_t v) noexcept requires (Mode != 2) : value_(v) {}
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// copy construction
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min_expl(const min_expl&) requires (Mode != 3) = default;
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// move construction
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min_expl(min_expl&&) requires (Mode != 4) = default;
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min_expl(min_expl&&) requires (Mode == 4) = delete;
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// copy assignment
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min_expl& operator=(const min_expl&) requires (Mode != 5) = default;
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// move assignment
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min_expl& operator=(min_expl&&) requires (Mode != 6) = default;
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min_expl& operator=(min_expl&&) requires (Mode == 6) = delete;
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// equality
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[[nodiscard]] bool operator==(const min_expl&) const requires (Mode != 7) = default;
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// scalability - multiplication
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[[nodiscard]] friend constexpr min_expl operator*(const min_expl& lhs, const min_expl& rhs) requires (Mode != 8)
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{ return min_expl(lhs.value_ * rhs.value_); }
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// scalability - division
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[[nodiscard]] friend constexpr min_expl operator/(const min_expl& lhs, const min_expl& rhs) requires (Mode != 9)
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{ return min_expl(lhs.value_ / rhs.value_); }
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};
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}
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template<int Mode>
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struct std::common_type<std::intmax_t, min_expl<Mode>> : std::type_identity<min_expl<Mode>> {};
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template<int Mode>
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struct std::common_type<min_expl<Mode>, std::intmax_t> : std::type_identity<min_expl<Mode>> {};
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namespace {
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using namespace units;
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using namespace units::physical::si;
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// quantity explicitly constructible (not convertible) from the representation type
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static_assert(std::constructible_from<length<metre, min_expl<>>, min_expl<>>);
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static_assert(!std::convertible_to<min_expl<>, length<metre, min_expl<>>>);
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// not constructible from an underlying type
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static_assert(!std::constructible_from<length<metre, min_expl<>>, int>);
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static_assert(!std::convertible_to<int, length<metre, min_expl<>>>);
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// dimensionless quantity implicitly convertible from the representation type
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static_assert(std::constructible_from<dimensionless<one, min_expl<>>, min_expl<>>);
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static_assert(std::convertible_to<min_expl<>, dimensionless<one, min_expl<>>>);
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// but not from an underlying type
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static_assert(!std::constructible_from<dimensionless<one, min_expl<>>, int>);
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static_assert(!std::convertible_to<int, dimensionless<one, min_expl<>>>);
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// or for ratio != 1
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static_assert(std::constructible_from<dimensionless<percent, min_expl<>>, min_expl<>>);
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static_assert(!std::convertible_to<min_expl<>, dimensionless<percent, min_expl<>>>);
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// quantity convertible from itself
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static_assert(std::constructible_from<length<metre, min_expl<>>, length<metre, min_expl<>>>);
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static_assert(std::convertible_to<length<metre, min_expl<>>, length<metre, min_expl<>>>);
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// not convertible from an underlying type
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static_assert(!std::constructible_from<length<metre, min_expl<>>, length<metre, int>>);
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static_assert(!std::convertible_to<length<metre, int>, length<metre, min_expl<>>>);
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// quantity convertible from another non truncating unit
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static_assert(std::constructible_from<length<metre, min_expl<>>, length<kilometre, min_expl<>>>);
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static_assert(std::convertible_to<length<kilometre, min_expl<>>, length<metre, min_expl<>>>);
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// quantity not convertible from another truncating unit
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static_assert(!std::constructible_from<length<kilometre, min_expl<>>, length<metre, min_expl<>>>);
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static_assert(!std::convertible_to<length<metre, min_expl<>>, length<kilometre, min_expl<>>>);
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// rep type with explicit constructor - implicit construction of rep not allowed
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static_assert(!std::constructible_from<length<metre, min_expl<>>, int>);
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static_assert(!std::convertible_to<int, length<metre, min_expl<>>>);
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static_assert(!std::constructible_from<length<metre, min_expl<>>, length<metre, int>>);
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static_assert(!std::convertible_to<length<metre, int>, length<metre, min_expl<>>>);
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static_assert(!std::constructible_from<length<metre, int>, min_expl<>>);
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static_assert(!std::convertible_to<min_expl<>, length<metre, int>>);
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static_assert(!std::constructible_from<length<metre, int>, length<metre, min_expl<>>>);
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static_assert(!std::convertible_to<length<metre, min_expl<>>, length<metre, int>>);
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// all operations needed to satisfy concept
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static_assert(QuantityValue<min_expl<>>);
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static_assert(!QuantityValue<min_expl<1>>);
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static_assert(!QuantityValue<min_expl<2>>);
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static_assert(!QuantityValue<min_expl<3>>);
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#if !defined(COMP_GCC) || COMP_GCC > 10 || COMP_GCC_MINOR > 1
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static_assert(!QuantityValue<min_expl<4>>);
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#endif
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static_assert(!QuantityValue<min_expl<5>>);
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#if !defined(COMP_GCC) || COMP_GCC > 10 || COMP_GCC_MINOR > 1
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static_assert(!QuantityValue<min_expl<6>>);
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#endif
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static_assert(!QuantityValue<min_expl<7>>);
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static_assert(!QuantityValue<min_expl<8>>);
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static_assert(!QuantityValue<min_expl<9>>);
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// quantity's operators should mirror the representation type capabilities
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template<typename Rep>
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concept invalid_member_operations = requires(length<metre, Rep> lhs) {
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requires !requires { +lhs; };
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requires !requires { -lhs; };
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requires !requires { ++lhs; };
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requires !requires { lhs++; };
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requires !requires { --lhs; };
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requires !requires { lhs--; };
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requires !requires(length<metre, Rep> rhs) { lhs += rhs; };
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requires !requires(length<metre, Rep> rhs) { lhs -= rhs; };
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requires !requires(Rep rhs) { lhs *= rhs; };
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requires !requires(Rep rhs) { lhs /= rhs; };
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requires !requires(Rep rhs) { lhs %= rhs; };
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requires !requires(length<metre, Rep> rhs) { lhs %= rhs; };
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requires !requires(length<metre, Rep> rhs) { lhs + rhs; };
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requires !requires(length<metre, Rep> rhs) { lhs - rhs; };
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requires !requires(Rep rhs) { lhs % rhs; };
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requires !requires(length<metre, Rep> rhs) { lhs % rhs; };
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requires !requires(length<metre, Rep> rhs) { lhs < rhs; };
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requires !requires(length<metre, Rep> rhs) { lhs > rhs; };
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requires !requires(length<metre, Rep> rhs) { lhs <= rhs; };
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requires !requires(length<metre, Rep> rhs) { lhs >= rhs; };
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requires !requires(length<metre, int> rhs) { lhs + rhs; };
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requires !requires(length<metre, int> rhs) { lhs - rhs; };
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requires !requires(int rhs) { lhs % rhs; };
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requires !requires(length<metre, int> rhs) { lhs % rhs; };
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requires !requires(length<metre, int> rhs) { lhs == rhs; };
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requires !requires(length<metre, int> rhs) { lhs != rhs; };
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requires !requires(length<metre, int> rhs) { lhs < rhs; };
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requires !requires(length<metre, int> rhs) { lhs > rhs; };
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requires !requires(length<metre, int> rhs) { lhs <= rhs; };
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requires !requires(length<metre, int> rhs) { lhs >= rhs; };
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requires !requires(std::ostream os) { os << lhs; };
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};
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static_assert(invalid_member_operations<min_expl<>>);
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// equality
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static_assert(length<kilometre, min_expl<>>(min_expl<>(2)) == length<metre, min_expl<>>(min_expl<>(2000)));
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static_assert(length<metre, min_expl<>>(min_expl<>(123)) * min_expl<>(2) == length<metre, min_expl<>>(min_expl<>(246)));
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static_assert(length<metre, min_expl<>>(min_expl<>(123)) * quantity{min_expl<>(2)} == length<metre, min_expl<>>(min_expl<>(246)));
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static_assert(min_expl<>(2) * length<metre, min_expl<>>(min_expl<>(123)) == length<metre, min_expl<>>(min_expl<>(246)));
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static_assert(quantity{min_expl<>(2)} * length<metre, min_expl<>>(min_expl<>(123)) == length<metre, min_expl<>>(min_expl<>(246)));
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static_assert(length<metre, min_expl<>>(min_expl<>(246)) / min_expl<>(2) == length<metre, min_expl<>>(min_expl<>(123)));
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static_assert(length<metre, min_expl<>>(min_expl<>(246)) / quantity{min_expl<>(2)} == length<metre, min_expl<>>(min_expl<>(123)));
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static_assert(length<metre, min_expl<>>(min_expl<>(246)) / length<metre, min_expl<>>(min_expl<>(2)) == quantity{min_expl<>(123)});
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static_assert(length<metre, min_expl<>>(min_expl<>(246)) / length<metre, min_expl<>>(min_expl<>(2)) == min_expl<>(123));
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} // namespace
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