#include <alpaqa/util/type-erasure.hpp>
Class for polymorphism through type erasure.
Saves the entire vtable, and uses small buffer optimization.
Definition at line 199 of file type-erasure.hpp.
Classes | |
struct | Deallocator |
Deallocates the storage when destroyed. More... | |
Public Types | |
using | allocator_type = Allocator |
Public Member Functions | |
TypeErased () noexcept(noexcept(allocator_type()))=default | |
Default constructor. | |
template<class Alloc > | |
TypeErased (std::allocator_arg_t, const Alloc &alloc) | |
Default constructor (allocator aware). | |
TypeErased (const TypeErased &other) | |
Copy constructor. | |
TypeErased (const TypeErased &other, allocator_type alloc) | |
Copy constructor (allocator aware). | |
TypeErased & | operator= (const TypeErased &other) |
Copy assignment. | |
TypeErased (TypeErased &&other) noexcept | |
Move constructor. | |
TypeErased (TypeErased &&other, const allocator_type &alloc) noexcept | |
Move constructor (allocator aware). | |
TypeErased & | operator= (TypeErased &&other) noexcept |
Move assignment. | |
~TypeErased () | |
Destructor. | |
template<class T , class Alloc > | |
TypeErased (std::allocator_arg_t, const Alloc &alloc, T &&d) | |
Main constructor that type-erases the given argument. | |
template<class T , class Alloc , class... Args> | |
TypeErased (std::allocator_arg_t, const Alloc &alloc, te_in_place_t< T >, Args &&...args) | |
Main constructor that type-erases the object constructed from the given argument. | |
template<class T > requires no_child_of_ours<T> | |
TypeErased (T &&d) | |
Main constructor that type-erases the given argument. | |
template<class T , class... Args> | |
TypeErased (te_in_place_t< T >, Args &&...args) | |
Main constructor that type-erases the object constructed from the given argument. | |
operator bool () const noexcept | |
Check if this wrapper wraps an object. | |
bool | owns_referenced_object () const noexcept |
Check if this wrapper owns the storage of the wrapped object, or whether it simply stores a reference to an object that was allocated elsewhere. | |
bool | referenced_object_is_const () const noexcept |
Check if the wrapped object is const. | |
allocator_type | get_allocator () const noexcept |
Get a copy of the allocator. | |
const std::type_info & | type () const noexcept |
Query the contained type. | |
template<class T > requires (!std::is_const_v<T>) | |
T & | as () & |
Convert the type-erased object to the given type. | |
template<class T > requires (std::is_const_v<T>) | |
T & | as () const & |
Convert the type-erased object to the given type. | |
template<class T > | |
T && | as () && |
Convert the type-erased object to the given type. | |
void * | get_pointer () const |
Get a type-erased pointer to the wrapped object. | |
const void * | get_const_pointer () const |
Get a type-erased pointer to the wrapped object. | |
Static Public Member Functions | |
template<class Ret , class T , class Alloc , class... Args> requires std::is_base_of_v<TypeErased, Ret> | |
static Ret | make (std::allocator_arg_t tag, const Alloc &alloc, Args &&...args) |
Construct a type-erased wrapper of type Ret for an object of type T, initialized in-place with the given arguments. | |
template<class Ret , class T , class... Args> requires no_leading_allocator<Args...> | |
static Ret | make (Args &&...args) |
Construct a type-erased wrapper of type Ret for an object of type T, initialized in-place with the given arguments. | |
Static Public Attributes | |
static constexpr size_t | small_buffer_size = SmallBufferSize |
Protected Member Functions | |
template<class T , class... Args> | |
void | construct_inplace (Args &&...args) |
Ensure storage and construct the type-erased object of type T in-place. | |
template<class Ret , class... FArgs, class... Args> | |
decltype(auto) | call (Ret(*f)(const void *, FArgs...), Args &&...args) const |
Call the vtable function f with the given arguments args , implicitly passing the self pointer and vtable reference if necessary. | |
template<class Ret , class... FArgs, class... Args> | |
decltype(auto) | call (Ret(*f)(void *, FArgs...), Args &&...args) |
Call the vtable function f with the given arguments args , implicitly passing the self pointer and vtable reference if necessary. | |
template<class Ret > | |
decltype(auto) | call (Ret(*f)(const void *)) const |
Call the vtable function f with the given arguments args , implicitly passing the self pointer and vtable reference if necessary. | |
template<class Ret > | |
decltype(auto) | call (Ret(*f)(void *)) |
Call the vtable function f with the given arguments args , implicitly passing the self pointer and vtable reference if necessary. | |
template<class Ret > | |
decltype(auto) | call (Ret(*f)(const void *, const VTable &)) const |
Call the vtable function f with the given arguments args , implicitly passing the self pointer and vtable reference if necessary. | |
template<class Ret > | |
decltype(auto) | call (Ret(*f)(void *, const VTable &)) |
Call the vtable function f with the given arguments args , implicitly passing the self pointer and vtable reference if necessary. | |
Static Protected Member Functions | |
static bool | size_indicates_ownership (size_t size) |
static bool | size_indicates_const (size_t size) |
Protected Attributes | |
void * | self = nullptr |
Pointer to the stored object. | |
size_t | size = invalid_size |
Size required to store the object. | |
VTable | vtable |
Static Protected Attributes | |
static constexpr size_t | invalid_size |
static constexpr size_t | mut_ref_size |
static constexpr size_t | const_ref_size |
Private Types | |
using | allocator_traits = std::allocator_traits< allocator_type > |
using | buffer_type = std::array< std::byte, small_buffer_size > |
Private Member Functions | |
Deallocator | allocate (size_t size) |
Ensure that storage is available, either by using the small buffer if it is large enough, or by calling the allocator. | |
void | deallocate () |
Deallocate the memory without invoking the destructor. | |
void | cleanup () |
Destroy the type-erased object (if not empty), and deallocate the memory if necessary. | |
template<bool CopyAllocator> | |
void | do_copy_assign (const TypeErased &other) |
Private Attributes | |
buffer_type | small_buffer |
allocator_type | allocator |
Static Private Attributes | |
template<class T > | |
static constexpr auto | no_child_of_ours |
True if T is not a child class of TypeErased. | |
using allocator_type = Allocator |
Definition at line 202 of file type-erasure.hpp.
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private |
Definition at line 205 of file type-erasure.hpp.
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private |
Definition at line 206 of file type-erasure.hpp.
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defaultnoexcept |
Default constructor.
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inline |
Default constructor (allocator aware).
Definition at line 241 of file type-erasure.hpp.
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inline |
Copy constructor.
Definition at line 243 of file type-erasure.hpp.
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inline |
Copy constructor (allocator aware).
Definition at line 249 of file type-erasure.hpp.
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inlinenoexcept |
Move constructor.
Definition at line 265 of file type-erasure.hpp.
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inlinenoexcept |
Move constructor (allocator aware).
Definition at line 284 of file type-erasure.hpp.
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inline |
Destructor.
Definition at line 375 of file type-erasure.hpp.
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inlineexplicit |
Main constructor that type-erases the given argument.
Definition at line 379 of file type-erasure.hpp.
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inlineexplicit |
Main constructor that type-erases the object constructed from the given argument.
Definition at line 386 of file type-erasure.hpp.
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inlineexplicit |
Main constructor that type-erases the given argument.
Requirement prevents this constructor from taking precedence over the copy and move constructors.
Definition at line 396 of file type-erasure.hpp.
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inlineexplicit |
Main constructor that type-erases the object constructed from the given argument.
Definition at line 402 of file type-erasure.hpp.
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inline |
Copy assignment.
Definition at line 254 of file type-erasure.hpp.
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inlinenoexcept |
Move assignment.
Definition at line 322 of file type-erasure.hpp.
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inlinestatic |
Construct a type-erased wrapper of type Ret for an object of type T, initialized in-place with the given arguments.
Definition at line 410 of file type-erasure.hpp.
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inlinestatic |
Construct a type-erased wrapper of type Ret for an object of type T, initialized in-place with the given arguments.
Definition at line 420 of file type-erasure.hpp.
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inlineexplicitnoexcept |
Check if this wrapper wraps an object.
False for default-constructed objects.
Definition at line 427 of file type-erasure.hpp.
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inlinenoexcept |
Check if this wrapper owns the storage of the wrapped object, or whether it simply stores a reference to an object that was allocated elsewhere.
Definition at line 432 of file type-erasure.hpp.
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inlinenoexcept |
Check if the wrapped object is const.
Definition at line 437 of file type-erasure.hpp.
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inlinenoexcept |
Get a copy of the allocator.
Definition at line 442 of file type-erasure.hpp.
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inlinenoexcept |
Query the contained type.
Definition at line 445 of file type-erasure.hpp.
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inline |
Convert the type-erased object to the given type.
alpaqa::util::bad_type_erased_type | If T does not match the stored type. |
Definition at line 454 of file type-erasure.hpp.
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inline |
Convert the type-erased object to the given type.
alpaqa::util::bad_type_erased_type | If T does not match the stored type. |
Definition at line 464 of file type-erasure.hpp.
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inline |
Convert the type-erased object to the given type.
alpaqa::util::bad_type_erased_type | If T does not match the stored type. |
Definition at line 471 of file type-erasure.hpp.
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inline |
Get a type-erased pointer to the wrapped object.
alpaqa::util::bad_type_erased_constness | If the wrapped object is const. |
Definition at line 483 of file type-erasure.hpp.
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inline |
Get a type-erased pointer to the wrapped object.
Definition at line 489 of file type-erasure.hpp.
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inlineprivate |
Ensure that storage is available, either by using the small buffer if it is large enough, or by calling the allocator.
Returns a RAII wrapper that deallocates the storage unless released.
Definition at line 515 of file type-erasure.hpp.
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inlineprivate |
Deallocate the memory without invoking the destructor.
Definition at line 527 of file type-erasure.hpp.
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inlineprivate |
Destroy the type-erased object (if not empty), and deallocate the memory if necessary.
Definition at line 539 of file type-erasure.hpp.
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inlineprivate |
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inlineprotected |
Ensure storage and construct the type-erased object of type T in-place.
Definition at line 575 of file type-erasure.hpp.
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inlineprotected |
Call the vtable function f
with the given arguments args
, implicitly passing the self pointer and vtable reference if necessary.
Definition at line 599 of file type-erasure.hpp.
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inlineprotected |
Call the vtable function f
with the given arguments args
, implicitly passing the self pointer and vtable reference if necessary.
Definition at line 611 of file type-erasure.hpp.
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inlineprotected |
Call the vtable function f
with the given arguments args
, implicitly passing the self pointer and vtable reference if necessary.
Definition at line 625 of file type-erasure.hpp.
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inlineprotected |
Call the vtable function f
with the given arguments args
, implicitly passing the self pointer and vtable reference if necessary.
Definition at line 632 of file type-erasure.hpp.
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inlineprotected |
Call the vtable function f
with the given arguments args
, implicitly passing the self pointer and vtable reference if necessary.
Definition at line 641 of file type-erasure.hpp.
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inlineprotected |
Call the vtable function f
with the given arguments args
, implicitly passing the self pointer and vtable reference if necessary.
Definition at line 649 of file type-erasure.hpp.
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staticconstexpr |
Definition at line 201 of file type-erasure.hpp.
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private |
Definition at line 207 of file type-erasure.hpp.
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private |
Definition at line 208 of file type-erasure.hpp.
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staticconstexprprivate |
True if T
is not a child class of TypeErased.
Definition at line 213 of file type-erasure.hpp.
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staticconstexprprotected |
Definition at line 217 of file type-erasure.hpp.
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staticconstexprprotected |
Definition at line 219 of file type-erasure.hpp.
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staticconstexprprotected |
Definition at line 221 of file type-erasure.hpp.
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protected |
Pointer to the stored object.
Definition at line 231 of file type-erasure.hpp.
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protected |
Size required to store the object.
Definition at line 233 of file type-erasure.hpp.
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protected |
Definition at line 234 of file type-erasure.hpp.