Class TensorNetwork::Edge¶
Defined in File tensor_network.hpp
Nested Relationships¶
This class is a nested type of Class TensorNetwork.
Nested Types¶
Class Documentation¶
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class Edge
Edge in a TensorNetwork = the Index annotating it + a pair of indices to identify which Tensor terminals it’s connected to.
Note
tensor terminals in a sequence of tensors are indexed as follows:
>0 for bra terminals (i.e. “+7” indicated connection to a bra terminal of 7th tensor object in the sequence)
<0 for ket terminals
0 if free (not attached to any tensor objects)
position records the terminal’s location in the sequence of bra/ket/aux terminals (always 0 for symmetric/antisymmetric tensors) Terminal indices are sorted by the tensor index (i.e. by the absolute value of the terminal index), followed by position
Public Functions
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Edge() = default
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inline explicit Edge(const Terminal &t)
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inline bool operator<(const Edge &other) const
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inline const auto &first() const
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inline const auto &second() const
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inline const auto &operator[](std::size_t i) const
access terminals by index, nonnull terminals first
- Parameters:
i – the ordinal index,
imust be 0 or 1- Returns:
if
i==0return first(), if nonnull, else second(), if nonnull, else null; ifi==1return second(), if nonnull, else else null;
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inline auto size() const
- Returns:
the number of attached terminals (0, 1, or 2)
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inline const Index &idx() const
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struct Terminal
Public Functions
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inline Terminal() noexcept
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inline Terminal(int tensor_ord, TensorIndexSlotType slot_type, int slot_group_ord) noexcept
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inline explicit operator bool() const
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inline bool null() const
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inline bool nonnull() const
Public Members
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int tensor_ord = -1
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TensorIndexSlotType slot_type = TensorIndexSlotType::Invalid
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int slot_group_ord = -1
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inline Terminal() noexcept