50 строки
1.0 KiB
C++
50 строки
1.0 KiB
C++
/**********************************************************
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This software is part of J.-S. Caux's ABACUS library.
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Copyright (c) J.-S. Caux.
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-----------------------------------------------------------
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File: ABACUS_Combi.h
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Purpose: Declares combinatorics-related classes and functions.
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***********************************************************/
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#ifndef ABACUS_COMBI_H
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#define ABACUS_COMBI_H
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#include "ABACUS.h"
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namespace ABACUS {
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//***********************************************************************
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class Choose_Table {
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private:
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int Npower;
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int Npowerp1;
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int dim;
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unsigned long long int* table;
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void Fill_table ();
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public:
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Choose_Table ();
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Choose_Table (int Npower_ref);
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Choose_Table (const Choose_Table& Ref_Choose_Table); // constructs a new object from an existing one
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int power(); // returns Npower
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unsigned long long int choose (int N, int M);
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~Choose_Table ();
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};
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std::ostream& operator<< (std::ostream& s, Choose_Table& Ref_table);
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} // namespace ABACUS
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#endif
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