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regarded and expertly designed C++ library projects in the
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— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
boost::random::uniform_on_sphere
// In header: <boost/random/uniform_on_sphere.hpp> template<typename RealType = double, typename Cont = std::vector<RealType> > class uniform_on_sphere { public: // types typedef RealType input_type; typedef Cont result_type; // member classes/structs/unions class param_type { public: // types typedef uniform_on_sphere distribution_type; // construct/copy/destruct explicit param_type(int = 2); // public member functions int dim() const; // friend functions template<typename CharT, typename Traits> friend std::basic_ostream< CharT, Traits > & operator<<(std::basic_ostream< CharT, Traits > &, const param_type &); template<typename CharT, typename Traits> friend std::basic_istream< CharT, Traits > & operator>>(std::basic_istream< CharT, Traits > &, const param_type &); friend bool operator==(const param_type &, const param_type &); friend bool operator!=(const param_type &, const param_type &); }; // construct/copy/destruct explicit uniform_on_sphere(int = 2); explicit uniform_on_sphere(const param_type &); // public member functions int dim() const; param_type param() const; void param(const param_type &); result_type min() const; result_type max() const; void reset(); template<typename Engine> const result_type & operator()(Engine &); template<typename Engine> result_type operator()(Engine &, const param_type &) const; // friend functions template<typename CharT, typename Traits> friend std::basic_ostream< CharT, Traits > & operator<<(std::basic_ostream< CharT, Traits > &, const uniform_on_sphere &); template<typename CharT, typename Traits> friend std::basic_istream< CharT, Traits > & operator>>(std::basic_istream< CharT, Traits > &, const uniform_on_sphere &); friend bool operator==(const uniform_on_sphere &, const uniform_on_sphere &); friend bool operator!=(const uniform_on_sphere &, const uniform_on_sphere &); };
Instantiations of class template uniform_on_sphere model a random distribution . Such a distribution produces random numbers uniformly distributed on the unit sphere of arbitrary dimension dim
. The Cont
template parameter must be a STL-like container type with begin and end operations returning non-const ForwardIterators of type Cont::iterator
.
uniform_on_sphere
public
construct/copy/destructexplicit uniform_on_sphere(int dim = 2);
Constructs a
distribution. uniform_on_sphere
dim
is the dimension of the sphere.
Requires: dim >= 0
explicit uniform_on_sphere(const param_type & param);
Constructs a
distribution from its parameters. uniform_on_sphere
uniform_on_sphere
public member functionsint dim() const;
Returns the dimension of the sphere.
param_type param() const;
Returns the parameters of the distribution.
void param(const param_type & param);
Sets the parameters of the distribution.
result_type min() const;
Returns the smallest value that the distribution can produce. Note that this is required to approximate the standard library's requirements. The behavior is defined according to lexicographical comparison so that for a container type of std::vector, dist.min() <= x <= dist.max() where x is any value produced by the distribution.
result_type max() const;
Returns the largest value that the distribution can produce. Note that this is required to approximate the standard library's requirements. The behavior is defined according to lexicographical comparison so that for a container type of std::vector, dist.min() <= x <= dist.max() where x is any value produced by the distribution.
void reset();
Effects: Subsequent uses of the distribution do not depend on values produced by any engine prior to invoking reset.
template<typename Engine> const result_type & operator()(Engine & eng);
Returns a point uniformly distributed over the surface of a sphere of dimension dim().
template<typename Engine> result_type operator()(Engine & eng, const param_type & param) const;
Returns a point uniformly distributed over the surface of a sphere of dimension param.dim().
uniform_on_sphere
friend functionstemplate<typename CharT, typename Traits> friend std::basic_ostream< CharT, Traits > & operator<<(std::basic_ostream< CharT, Traits > & os, const uniform_on_sphere & sd);
Writes the distribution to a std::ostream
.
template<typename CharT, typename Traits> friend std::basic_istream< CharT, Traits > & operator>>(std::basic_istream< CharT, Traits > & is, const uniform_on_sphere & sd);
Reads the distribution from a std::istream
.
friend bool operator==(const uniform_on_sphere & lhs, const uniform_on_sphere & rhs);
Returns true if the two distributions will produce identical sequences of values, given equal generators.
friend bool operator!=(const uniform_on_sphere & lhs, const uniform_on_sphere & rhs);
Returns true if the two distributions may produce different sequences of values, given equal generators.