constants.h

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/*
 * This file is part of Quantum++.
 *
 * MIT License
 *
 * Copyright (c) 2013 - 2020 Vlad Gheorghiu.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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 */

#ifndef CONSTANTS_H_
#define CONSTANTS_H_

namespace qpp {
inline namespace literals {
inline constexpr cplx operator"" _i(unsigned long long int x) noexcept {
    return {0., static_cast<double>(x)};
}

inline constexpr cplx operator"" _i(long double x) noexcept {
    return {0., static_cast<double>(x)};
}

inline constexpr std::complex<float>
operator"" _if(unsigned long long int x) noexcept {
    return {0., static_cast<float>(x)};
}

inline constexpr std::complex<float> operator"" _if(long double x) noexcept {
    return {0., static_cast<float>(x)};
}

} /* namespace literals */

constexpr double chop = 1e-14;

constexpr idx maxn = 64; // maximum number of qubits/qudits a state may have

constexpr double pi = 3.141592653589793238462643383279502884;
constexpr double ee = 2.718281828459045235360287471352662497;

constexpr double infty = std::numeric_limits<double>::max();

inline cplx omega(idx D) {
    if (D == 0)
        throw exception::OutOfRange("qpp::omega()");
    return exp(2.0 * pi * 1_i / static_cast<double>(D));
}

enum {
    RES = 0,  
    PROB = 1, 
    ST = 2,   
};

} /* namespace qpp */

#endif /* CONSTANTS_H_ */