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better handle simultaneous change of representation, unit and point_origin in value_cast, to prevent overflow in more cases.

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This commit is contained in:
Yves Delley
2024-05-12 10:57:33 +02:00
parent c51baae074
commit c0efdb1790
2 changed files with 62 additions and 17 deletions
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30
test/static/quantity_point_test.cpp
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@ -1695,21 +1695,25 @@ static_assert(value_cast<m, float>(lvalue_qp).quantity_from_zero().numerical_val
static_assert(value_cast<quantity<km, int>>(quantity_point{2000 * m}).quantity_from_zero().numerical_value_in(km) == 2);
static_assert(value_cast<quantity_point<km>>(quantity_point{2000 * m}).quantity_from_zero().numerical_value_in(km) ==
2);
static_assert(
!requires(quantity_point<isq::width[m]> qp) { value_cast<quantity<m>>(qp); },
"value_cast shall not cast between different quantity types");
static_assert(
!requires(quantity_point<m> qp) { value_cast<quantity<isq::width[m]>>(qp); },
"value_cast shall not cast between different quantity types");
static_assert(value_cast<quantity_point<m, mean_sea_level>>(quantity_point<km, ground_level>{2 * km})
.quantity_ref_from(mean_sea_level)
template<typename ToQ, typename FromQ>
constexpr bool value_cast_is_forbidden()
{
// it appears we cannot have the requires clause right inside static_assert
return !requires(FromQ q) { value_cast<ToQ>(q); };
}
static_assert(value_cast_is_forbidden<quantity_point<m>, quantity_point<isq::width[m]>>(),
"value_cast shall not cast between different quantity types");
static_assert(value_cast_is_forbidden<quantity_point<isq::width[m]>, quantity_point<m>>(),
"value_cast shall not cast between different quantity types");
static_assert(value_cast<quantity_point<isq::height[m], mean_sea_level>>(quantity_point{2 * isq::height[km], ground_level})
.quantity_from_origin_is_an_implementation_detail_
.numerical_value_in(m) == 2042);
static_assert(value_cast<quantity_point<cm, mean_sea_level, int>>(quantity_point<mm, ground_level, std::int8_t>{
std::int8_t{100} * mm})
.quantity_ref_from(mean_sea_level)
static_assert(value_cast<quantity_point<isq::height[cm], mean_sea_level, int>>(quantity_point{std::int8_t{100} * isq::height[mm], ground_level})
.quantity_from_origin_is_an_implementation_detail_
.numerical_value_in(cm) == 4210);
static_assert(value_cast<quantity_point<mm, ground_level, std::int8_t>>(quantity_point<cm, mean_sea_level>{4210 * cm})
.quantity_ref_from(ground_level)
static_assert(value_cast<quantity_point<isq::height[mm], ground_level, std::int8_t>>(quantity_point{4210 * isq::height[cm], mean_sea_level})
.quantity_from_origin_is_an_implementation_detail_
.numerical_value_in(mm) == 100);