ProductState

A product state of local configurations.

Sources
product_state.hpp
product_state.cpp
product_state.jl

---

Constructors

C++Julia

ProductState(int64_t nsites);
ProductState(std::vector<std::string> const &local_states);

ProductState(nsites::Int64)
ProductState(local_states::Vector{String})

Parameter	Description
nsites	construct a product state on nsites
local_states	the local configurations of the product state

---

Iteration

A ProductState can be iterated over, where at each iteration the string of the local configuration is retured. Here is an example:

C++Julia

auto pstate = ProductState({"Up", "Dn", "Emp", "UpDn"});
for (auto s : pstate) {
    Log("{}", s);
}

pstate = ProductState(["Up", "Dn", "Emp", "UpDn"])
for s in pstate
    @show s
end

---

Methods

nsites

Returns the number of sites of the product state

C++Julia

int64_t nsites(ProductState const &p);

nsites(p::ProductState)

---

size

Returns the number of sites of the product state. Same as "nsites".

C++Julia

int64_t size(ProductState const &p);

size(state::ProductState)

---

setindex! / operator[]

Sets the local configuration at the given site index to the given string.

C++Julia

std::string &operator[](int64_t i);

setindex!(state::ProductState, local_state::String, idx::Int64)

---

getindex / operator[]

Returns the string of the local configuration at the given site index.

C++Julia

std::string const &operator[](int64_t i) const;

getindex(state::ProductState, idx::Int64)

---

push! / push_back

Adds a local configuration add the end of the product state.

C++Julia

void push_back(std::string l);

push!(state::ProductState, local_state::String

---

Usage Example

C++Julia

auto pstate = ProductState({"Up", "Dn", "Emp", "UpDn"});
for (auto s : pstate) {
  Log("{}", s);
}
XDIAG_SHOW(to_string(pstate));

pstate = ProductState();
pstate.push_back("Dn");
pstate.push_back("Up");
pstate.push_back("Dn");
XDIAG_SHOW(pstate.nsites());
for (auto s : pstate) {
  Log("{}", s);
}
XDIAG_SHOW(to_string(pstate));

pstate = ProductState(["Up", "Dn", "Emp", "UpDn"])
for s in pstate
    @show s
end
@show pstate

pstate = ProductState()
push!(pstate, "Dn")
push!(pstate, "Up")
push!(pstate, "Dn")
@show nsites(pstate)
for s in pstate
    @show s
end
@show pstate