geometry::Triangle Class Reference

A triangle defined by its three side lengths. More...

#include <shapes.hpp>

Inheritance diagram for geometry::Triangle:

Collaboration diagram for geometry::Triangle:

Public Member Functions
	Triangle (double a, double b, double c)
	Construct a triangle from three side lengths.
double	area () const override
	Compute the area of the shape.
std::string	name () const override
	Return the human-readable name of the shape.
double	perimeter () const override
	Compute the perimeter of the shape.
Public Member Functions inherited from geometry::Shape
virtual	~Shape ()=default
	Virtual destructor for safe polymorphic deletion.
std::string	describe () const
	Pretty-print shape information.

Additional Inherited Members
Static Public Member Functions inherited from geometry::Shape
static int	instance_count ()
	Get the total count of Shape instances created.
Protected Member Functions inherited from geometry::Shape
	Shape ()
	Increment the instance counter.

Detailed Description

A triangle defined by its three side lengths.

The area is computed via Heron's formula:

\[ s = \frac{a + b + c}{2}, \qquad A = \sqrt{s(s-a)(s-b)(s-c)} \]

Warning

The triangle inequality must hold: each side must be less than the sum of the other two.

Definition at line 202 of file shapes.hpp.

Constructor & Destructor Documentation

Triangle()

geometry::Triangle::Triangle ( double a, double b, double c )

inline

Construct a triangle from three side lengths.

Parameters

a	First side.
b	Second side.
c	Third side.

Precondition

\( a + b > c \) and \( b + c > a \) and \( a + c > b \)

Definition at line 211 of file shapes.hpp.

: a_(a), b_(b), c_(c) {}

Member Function Documentation

area()

double geometry::Triangle::area ( ) const

inlinenodiscardoverridevirtual

Compute the area of the shape.

Returns

The area in square units.

Implements geometry::Shape.

Definition at line 213 of file shapes.hpp.

                                               {
        double s = (a_ + b_ + c_) / 2.0;
        return std::sqrt(s * (s - a_) * (s - b_) * (s - c_));
    }

name()

std::string geometry::Triangle::name ( ) const

inlinenodiscardoverridevirtual

Return the human-readable name of the shape.

Returns

A string like "Circle", "Rectangle", etc.

Implements geometry::Shape.

Definition at line 222 of file shapes.hpp.

{ return "Triangle"; }

perimeter()

double geometry::Triangle::perimeter ( ) const

inlinenodiscardoverridevirtual

Compute the perimeter of the shape.

Returns

The perimeter in linear units.

Implements geometry::Shape.

Definition at line 218 of file shapes.hpp.

                                                    {
        return a_ + b_ + c_;
    }

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

• demo/src/shapes.hpp