triqs_ctseg::tau_t

#include <triqs_ctseg/tau_t.hpp>

Detailed Description

Discretized Imaginary Time type tau_t. A point in imaginary time, i.e. $\tau \in [0,\beta]$, but defined on a very thin grid.

• Regular type.
• Rationale: the position in the segment is given by an uint64_t, i.e. a very long integer. This allows exact comparisons, which are notoriously dangerous on floating point number.

Definition at line 29 of file tau_t.hpp.

Public Member Functions
	tau_t (double x)
	For test only, not for users. Use the factories.
	tau_t (uint64_t n_)
	Not for users. Use the factories.
	operator double () const
	To cast to double, but it has to be done explicitly.
auto	operator<=> (tau_t const &tau) const
	Comparisons (using integer, so it is safe).

Static Public Member Functions
static tau_t	beta ()
	tau_t at tau = beta
static tau_t	epsilon ()
	Get epsilon, defined as $\epsilon = \beta /N_max$.
static tau_t	random (auto &rng, tau_t const &tau)
	Get a random point in $]0, tau[$.
static void	set_beta (double beta)
	Set the temperature.
static tau_t	zero ()
	$\tau = 0$

Static Public Attributes
static constexpr uint64_t	n_max = std::numeric_limits<uint64_t>::max()
	Maximum value that can be stored inside a uint64_t.

Friends
std::ostream &	operator<< (std::ostream &out, tau_t const &p)
	Stream insertion.

---

The documentation for this class was generated from the following file:

• triqs_ctseg/tau_t.hpp