qx::constexpr_sequence< tag_t, T, Start, Func > Class Template Reference

Constexpr sequence. use unique tag for different instances. More...

#include <constexpr_sequence.h>

Static Public Member Functions
template<size_t nIndex = checker_wrapper<0> {}.index(), T _value = element<nIndex> {}.value()>
static constexpr T	value () noexcept
	Get current sequence value. More...
template<size_t nIndex = checker_wrapper<0> {}.index(), T _value = element<nIndex> {}.value(), bool bStub = element_flag<nIndex> {}.test_and_set()>
static constexpr T	next () noexcept
	Change value by Func and return new value ¹details As function works through generating new template instance each time, return value will be the same for one code line. That means in loops you will get same value each time. Use macros like BOOST_PP_REPEAT to simplify the code. More...

Detailed Description

template<class tag_t, class T, T Start, T Func>
class qx::constexpr_sequence< tag_t, T, Start, Func >

Constexpr sequence. use unique tag for different instances.

Modified version of Anthony Williams constexpr counter https://stackoverflow.com/a/58200261/8021662

See also

examples in tests\test_constexpr_sequence.cpp

Note

that you can't vary other template parameters with same Tag prefer using "using my_sequence = qx::constexpr_sequence<...>"

Template Parameters

tag_t	- tag for unique instances
T	- value type
Start	- start value
Func	- function that modifies value

Author

Khrapov

Date

25.08.2020

Definition at line 42 of file constexpr_sequence.h.

Member Function Documentation

next()

template<class tag_t , class T , T Start, T Func>

template<size_t nIndex = checker_wrapper<0> {}.index(), T _value = element<nIndex> {}.value(), bool bStub = element_flag<nIndex> {}.test_and_set()>

static constexpr T qx::constexpr_sequence< tag_t, T, Start, Func >::next ( )

inlinestaticconstexprnoexcept

Change value by Func and return new value ¹details As function works through generating new template instance each time, return value will be the same for one code line. That means in loops you will get same value each time. Use macros like BOOST_PP_REPEAT to simplify the code.

Template Parameters

nIndex	- current sequence index
_value	- current sequence value
bStub	- stub parameter

Return values

-	next sequence value

Definition at line 125 of file constexpr_sequence.h.

value()

template<class tag_t , class T , T Start, T Func>

template<size_t nIndex = checker_wrapper<0> {}.index(), T _value = element<nIndex> {}.value()>

static constexpr T qx::constexpr_sequence< tag_t, T, Start, Func >::value ( )

inlinestaticconstexprnoexcept

Get current sequence value.

As function works through generating new template instance each time, return value will be the same for each code line. That means in loops you will get same value each time. Use macros like BOOST_PP_REPEAT to simplify the code

Template Parameters

nIndex	- current sequence index
_value	- current sequence value

Return values

-	current sequence value

Definition at line 105 of file constexpr_sequence.h.

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

• include/qx/meta/constexpr_sequence.h