71 lines
1.5 KiB
C++
71 lines
1.5 KiB
C++
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//#define USE_STD_ARRAY
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//#define WITH_VWR
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#if defined(WITH_VWR)
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# include <vectorwrapper/vectorops.hpp>
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#endif
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#if defined(USE_STD_ARRAY)
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# include <array>
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#endif
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#include <cstddef>
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#include <iostream>
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namespace {
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#if !defined(USE_STD_ARRAY)
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struct MyVecStruct {
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float x, y, z;
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};
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#endif
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} //unnamed namespace
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#if defined(WITH_VWR)
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namespace vwr {
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#if defined(USE_STD_ARRAY)
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template <> struct VectorWrapperInfo<std::array<float, 3>> {
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enum { dimensions = 3 };
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typedef float scalar_type;
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typedef std::array<float, 3> vector_type;
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static scalar_type& get_at (std::size_t idx, vector_type& v) {
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return v[idx];
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}
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};
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#else
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template <> struct VectorWrapperInfo<MyVecStruct> {
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enum { dimensions = 3 };
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typedef float scalar_type;
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typedef MyVecStruct vector_type;
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enum {
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offset_x = offsetof(MyVecStruct, x),
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offset_y = offsetof(MyVecStruct, y),
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offset_z = offsetof(MyVecStruct, z)
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};
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};
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#endif
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} //namespace vwr
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namespace {
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#if defined(USE_STD_ARRAY)
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typedef vwr::Vec<std::array<float, 3>, 3> vec3;
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#else
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typedef vwr::Vec<MyVecStruct, 3> vec3;
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#endif
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} //unnamed namespace
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#endif
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int main() {
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#if defined(WITH_VWR)
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vec3 v;
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std::cin >> v.x() >> v.y() >> v.z();
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const float sum = v.x() + v.y() + v.z();
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#elif defined(USE_STD_ARRAY)
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std::array<float, 3> arr;
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std::cin >> arr[0] >> arr[1] >> arr[2];
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const float sum = arr[0] + arr[1] + arr[2];
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#else
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MyVecStruct v;
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std::cin >> v.x >> v.y >> v.z;
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const float sum = v.x + v.y + v.z;
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#endif
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return static_cast<int>(sum);
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}
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