mirror of
https://github.com/MaSzyna-EU07/maszyna.git
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a083269867
Drop-in copy of C:\Users\maj00r\Projects\maj0sted-master minus its web/ directory - the WASM frontend is not being ported, the editor drives the same C++ API natively. What is left is plain C++20 with no dependencies: domain model (niweleta, plan and profile geometry, fitting, parallelism), project serialization, rail sampling and the editor document. src/web/ribbon.cpp was missing from the library source list; added, since without it the ribbon symbols never make it into the archive.
38 lines
998 B
C++
38 lines
998 B
C++
#pragma once
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#include <compare>
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#include <stdexcept>
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namespace maj0sted::domain {
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/// Value Object: a non-negative length, in metres (the unit of the default
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/// EPSG:2180 CRS). Lengths add and compare by value.
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class Length {
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public:
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constexpr Length() noexcept = default;
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static constexpr Length from_metres(double metres) {
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if (metres < 0.0) {
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throw std::invalid_argument{"Length cannot be negative"};
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}
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return Length{metres};
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}
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static constexpr Length zero() noexcept { return Length{}; }
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[[nodiscard]] constexpr double metres() const noexcept { return metres_; }
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[[nodiscard]] constexpr Length operator+(Length other) const noexcept {
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return Length{metres_ + other.metres_};
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}
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friend constexpr auto operator<=>(const Length&, const Length&) noexcept = default;
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private:
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explicit constexpr Length(double metres) noexcept : metres_{metres} {}
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double metres_{0.0};
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};
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} // namespace maj0sted::domain
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