Hash.hh

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#pragma once
 
#include "Storage.hh"
 
namespace cadabra
{
    enum HashFlags : unsigned int
    {
        HASH_DEFAULT = 0x0,
        HASH_IGNORE_TOP_MULTIPLIER = 0x1,
        HASH_IGNORE_MULTIPLIER = 0x2,
        HASH_IGNORE_PRODUCT_ORDER = 0x4,
        HASH_IGNORE_SUM_ORDER = 0x8,
        HASH_IGNORE_INDEX_ORDER = 0x10,
        HASH_IGNORE_PARENT_REL = 0x20,
        HASH_IGNORE_BRACKET_TYPE = 0x40,
        HASH_IGNORE_CHILDREN = 0x80,
        HASH_IGNORE_NAMES = 0x100,
        HASH_IGNORE_INDICES = 0x200,
        HASH_IGNORE_CHILD_ORDER = 0x400
    };
 
    class Ex_hasher
    {
    public:
        using result_t = size_t;
        Ex_hasher();
        Ex_hasher(HashFlags flags);
 
        result_t operator () (const Ex& ex) const;
        result_t operator () (Ex::iterator it) const;
 
        void set_flags(HashFlags flags);
        HashFlags get_flags() const;
        void add_flags(HashFlags flags);
        void remove_flags(HashFlags flags);
 
    private:
        result_t hash(Ex::iterator it, bool toplevel) const;
        bool flag_set(HashFlags flag) const;
 
        HashFlags flags;
    };
 
    HashFlags operator ~ (HashFlags flags);
    HashFlags operator | (HashFlags lhs, HashFlags rhs);
    HashFlags operator & (HashFlags lhs, HashFlags rhs);
    HashFlags& operator |= (HashFlags& lhs, HashFlags rhs);
    HashFlags& operator &= (HashFlags& lhs, HashFlags rhs);
 
    Ex_hasher::result_t hash_ex(Ex::iterator it, HashFlags flags = HASH_DEFAULT);
    bool hash_compare(Ex::iterator lhs, Ex::iterator rhs, HashFlags flags = HASH_DEFAULT);
}