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docs: "Quick Start" chapter updated with implicit origins

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Mateusz Pusz
2023-12-21 12:31:24 +01:00
parent fdacde606c
commit ea7c97dac7
1 changed files with 5 additions and 3 deletions
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docs/getting_started/quick_start.md
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@ -86,6 +86,8 @@ static_assert(140 * km / (2 * h) == 70 * km / h);
## Quantity points ## Quantity points
The quantity point specifies an absolute quantity with respect to an origin. The quantity point specifies an absolute quantity with respect to an origin.
If no origin is provided explicitly, an implicit one will be provided by the library.
Together with quantities, they model [The Affine Space](../users_guide/framework_basics/the_affine_space.md). Together with quantities, they model [The Affine Space](../users_guide/framework_basics/the_affine_space.md).
Quantity points should be used in all places where adding two values is meaningless Quantity points should be used in all places where adding two values is meaningless
@ -106,10 +108,10 @@ int main()
using namespace mp_units::si::unit_symbols; using namespace mp_units::si::unit_symbols;
using namespace mp_units::usc::unit_symbols; using namespace mp_units::usc::unit_symbols;
quantity_point temp = si::zeroth_degree_Celsius + 20. * deg_C; quantity_point temp{20. * deg_C};
std::cout << "Temperature: " std::cout << "Temperature: "
<< temp.quantity_from(si::zeroth_degree_Celsius) << " (" << temp.quantity_from_zero() << " ("
<< temp.in(deg_F).quantity_from(usc::zeroth_degree_Fahrenheit) << ")\n"; << temp.in(deg_F).quantity_from_zero() << ")\n";
} }
``` ```