hej
is hosted by
Hepforge
,
IPPP Durham
HEJ
2.1.4
High energy resummation for hadron colliders
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include
HEJ
utility.hh
Go to the documentation of this file.
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#pragma once
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#include <array>
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#include <memory>
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#include <string>
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#include "boost/core/demangle.hpp"
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#include "fastjet/PseudoJet.hh"
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namespace
HEJ
{
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inline
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std::string
join
(
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std::string
const
&
/* delim */
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){
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return
""
;
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}
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inline
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std::string
join
(
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std::string
const
&
/* delim */
, std::string
const
& str
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){
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return
str;
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}
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template
<
typename
... Strings>
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std::string
join
(
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std::string
const
& delim,
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std::string
const
& first, std::string
const
& second,
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Strings&&... rest
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){
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return
join
(delim, first + delim + second, std::forward<Strings>(rest)...);
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}
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template
<
typename
T>
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std::string
type_string
(T&&
/*unused*/
){
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return
boost::core::demangle(
typeid
(T).name());
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}
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template
<
typename
... T>
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constexpr
void
ignore
(T&&...
/*unused*/
) {}
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inline
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constexpr
bool
nearby_ep
(
double
a,
double
b,
double
ep){
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assert(ep > 0);
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return
std::abs(a-b) < ep;
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}
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inline
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bool
nearby_ep
(
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fastjet::PseudoJet
const
& pa, fastjet::PseudoJet
const
& pb,
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double
ep
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){
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assert(ep > 0);
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for
(
size_t
i = 0; i < 4; ++i){
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if
(!
nearby_ep
(pa[i], pb[i], ep))
return
false
;
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}
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return
true
;
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}
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inline
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bool
nearby
(
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fastjet::PseudoJet
const
& pa, fastjet::PseudoJet
const
& pb,
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double
const
norm = 1.
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){
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return
nearby_ep
(pa, pb, 1e-7*norm);
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}
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namespace
detail {
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template
<
typename
T, std::size_t N, std::size_t... Ns>
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struct
ArrayTag
{
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using
type
=
typename
ArrayTag<std::array<T, N>
, Ns...>
::type
;
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};
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template
<
typename
T, std::
size_t
N>
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struct
ArrayTag
<T, N> {
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using
type
= std::array<T, N>;
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};
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}
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// helper for multidimensional std::array, for example
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// MultiArray<T, N1, N2> = std::array<std::array<T, N1>, N2>
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template
<
typename
T, std::size_t N, std::size_t... Ns>
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using
MultiArray
=
typename
detail::ArrayTag
<T, N, Ns...>::type;
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}
// namespace HEJ
HEJ
Main HEJ 2 Namespace.
Definition:
mainpage.dox:1
HEJ::ignore
constexpr void ignore(T &&...)
Eliminate compiler warnings for unused variables.
Definition:
utility.hh:59
HEJ::type_string
std::string type_string(T &&)
Return the name of the argument's type.
Definition:
utility.hh:53
HEJ::join
std::string join(std::string const &)
Definition:
utility.hh:22
HEJ::MultiArray
typename detail::ArrayTag< T, N, Ns... >::type MultiArray
Definition:
utility.hh:102
HEJ::nearby
bool nearby(fastjet::PseudoJet const &pa, fastjet::PseudoJet const &pb, double const norm=1.)
Definition:
utility.hh:82
HEJ::nearby_ep
constexpr bool nearby_ep(double a, double b, double ep)
Check whether two doubles are closer than ep > 0 to each other.
Definition:
utility.hh:63
HEJ::detail::ArrayTag< T, N >::type
std::array< T, N > type
Definition:
utility.hh:96
HEJ::detail::ArrayTag
Definition:
utility.hh:91
HEJ::detail::ArrayTag::type
typename ArrayTag< std::array< T, N >, Ns... >::type type
Definition:
utility.hh:92
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