num::Vec2View Struct Reference

Non-owning view of a flat Vector as an array of 2D points. More...

#include <vector.hpp>

Public Member Functions
idx	size () const noexcept
	Number of 2D points (= v.size() / 2).
real &	x (idx i) noexcept
real	x (idx i) const noexcept
real &	y (idx i) noexcept
real	y (idx i) const noexcept

Public Attributes
Vector &	v

Detailed Description

Non-owning view of a flat Vector as an array of 2D points.

Many physics simulations pack 2D positions or velocities into a flat Vector with stride 2: element i has x = v[2i], y = v[2i+1]. Vec2View provides named accessors that eliminate the raw index arithmetic without copying or reshaping the data.

Example:

num::Vector q(2 * N);          // flat storage: [x0,y0, x1,y1, ...]
num::Vec2View pos{q};
pos.x(i) = 1.0;               // writes q[2*i]
pos.y(i) = 2.0;               // writes q[2*i+1]
idx n = pos.size();            // = N

Definition at line 170 of file vector.hpp.

Member Function Documentation

size()

idx num::Vec2View::size ( ) const

inlinenoexcept

Number of 2D points (= v.size() / 2).

Definition at line 174 of file vector.hpp.

References num::BasicVector< T >::size(), and v.

x() [1/2]

real num::Vec2View::x ( idx  i ) const

inlinenoexcept

Definition at line 177 of file vector.hpp.

References v.

x() [2/2]

real & num::Vec2View::x ( idx  i )

inlinenoexcept

Definition at line 176 of file vector.hpp.

References v.

y() [1/2]

real num::Vec2View::y ( idx  i ) const

inlinenoexcept

Definition at line 179 of file vector.hpp.

References v.

y() [2/2]

real & num::Vec2View::y ( idx  i )

inlinenoexcept

Definition at line 178 of file vector.hpp.

References v.

Member Data Documentation

v

Vector& num::Vec2View::v

Definition at line 171 of file vector.hpp.

Referenced by size(), x(), x(), y(), and y().

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The documentation for this struct was generated from the following file:

• /home/runner/work/numerics/numerics/include/core/vector.hpp