catalan_numbers Class Reference

computes and caches Catalan numbers More...

Collaboration diagram for catalan_numbers:

Public Member Functions
value_type	get (std::size_t n)
	computes the n-th Catalan number and updates the cache.

Private Types
using	value_type = std::uint64_t

Private Member Functions
value_type	compute_next ()
void	add ()

Private Attributes
std::vector< value_type >	known {1, 1}

Detailed Description

computes and caches Catalan numbers

for assert for std::uint64_t for std::size_t for std::plus & std::multiplies for std::transform_reduce for std::vector

Definition at line 22 of file catalan_numbers.cpp.

Member Typedef Documentation

value_type

using catalan_numbers::value_type = std::uint64_t

private

Definition at line 23 of file catalan_numbers.cpp.

Member Function Documentation

add()

void catalan_numbers::add ( )

inlineprivate

Definition at line 32 of file catalan_numbers.cpp.

{ known.push_back(this->compute_next()); }

compute_next()

value_type catalan_numbers::compute_next ( )

inlineprivate

Definition at line 26 of file catalan_numbers.cpp.

                              {
        return std::transform_reduce(known.begin(), known.end(), known.rbegin(),
                                     static_cast<value_type>(0), std::plus<>(),
                                     std::multiplies<>());
    }

get()

value_type catalan_numbers::get ( std::size_t n )

inline

computes the n-th Catalan number and updates the cache.

Returns

the n-th Catalan number

Definition at line 39 of file catalan_numbers.cpp.

                                {
        while (known.size() <= n) {
            this->add();
        }
        return known[n];
    }

Member Data Documentation

known

std::vector<value_type> catalan_numbers::known {1, 1}

private

Definition at line 24 of file catalan_numbers.cpp.

{1, 1};

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

• dynamic_programming/catalan_numbers.cpp