CECCO::details::Cache< ENTRIES > Class Template Reference

Heterogeneous cache indexed by entry ID. More...

#include <helpers.hpp>

Inheritance diagram for CECCO::details::Cache< ENTRIES >:

Public Member Functions
	Cache ()=default
template<auto ID>
bool	is_set () const noexcept
template<auto ID, typename TYPE>
void	set (TYPE &&value) const
template<auto ID>
bool	invalidate () const noexcept
bool	invalidate () const noexcept
template<auto ID>
const type_for< ID > &	operator() (auto &&calculate_func) const
template<auto ID>
std::optional< type_for< ID > >	get () const
template<auto ID>
const type_for< ID > &	get_or_compute (auto &&calculate_func) const

Detailed Description

template<typename... ENTRIES>
class CECCO::details::Cache< ENTRIES >

Heterogeneous cache indexed by entry ID.

Template Parameters

ENTRIES

Pack of CacheEntry types

Each ID gets its own std::optional<T> slot in a std::tuple, so different IDs may share the same value type without ambiguity. Lookup is by compile-time ID; an unknown ID is a compile-time error.

Warning

Not thread-safe for concurrent writes. Use external synchronisation if multiple threads may call set(), invalidate(), or operator() simultaneously.

Usage_Example

using Entry1 = CacheEntry<0, std::vector<int>>;
using Entry2 = CacheEntry<1, double>;
using Entry3 = CacheEntry<5, std::string>;  // IDs need not be consecutive
Cache<Entry1, Entry2, Entry3> cache;
 
cache.set<0>(std::vector<int>{1, 2, 3});
auto& vec = cache.get_or_compute<0>([] { return std::vector<int>{4, 5, 6}; });
if (cache.is_set<0>()) cache.invalidate<0>();

Definition at line 408 of file helpers.hpp.

Constructor & Destructor Documentation

Cache()

template<typename... ENTRIES>

CECCO::details::Cache< ENTRIES >::Cache ( )

default

Member Function Documentation

get()

template<typename... ENTRIES>

template<auto ID>

std::optional< type_for< ID > > CECCO::details::Cache< ENTRIES >::get ( ) const

inline

Definition at line 477 of file helpers.hpp.

get_or_compute()

template<typename... ENTRIES>

template<auto ID>

const type_for< ID > & CECCO::details::Cache< ENTRIES >::get_or_compute ( auto && calculate_func ) const

inline

Definition at line 482 of file helpers.hpp.

invalidate() [1/2]

template<typename... ENTRIES>

bool CECCO::details::Cache< ENTRIES >::invalidate ( ) const

inlinenoexcept

Definition at line 459 of file helpers.hpp.

invalidate() [2/2]

template<typename... ENTRIES>

template<auto ID>

bool CECCO::details::Cache< ENTRIES >::invalidate ( ) const

inlinenoexcept

Definition at line 452 of file helpers.hpp.

is_set()

template<typename... ENTRIES>

template<auto ID>

bool CECCO::details::Cache< ENTRIES >::is_set ( ) const

inlinenoexcept

Definition at line 442 of file helpers.hpp.

operator()()

template<typename... ENTRIES>

template<auto ID>

const type_for< ID > & CECCO::details::Cache< ENTRIES >::operator() ( auto && calculate_func ) const

inline

Definition at line 470 of file helpers.hpp.

set()

template<typename... ENTRIES>

template<auto ID, typename TYPE>

void CECCO::details::Cache< ENTRIES >::set ( TYPE && value ) const

inline

Definition at line 447 of file helpers.hpp.

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

• helpers.hpp