Variant implementation from the C++17 standard with C++11. The interface is inspired by the C++17 standard but it has changes in get and emplace since we are not allowed to throw exceptions.
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| constexpr | variant () noexcept=default |
| | the default constructor constructs a variant which does not contain an element and returns INVALID_VARIANT_INDEX when .index() is called
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| template<uint64_t N, typename... CTorArguments> |
| constexpr | variant (const in_place_index< N > &index, CTorArguments &&... args) noexcept |
| | creates a variant and perform an in place construction of the type stored at index N. If the index N is out of bounds you get a compiler error.
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| template<typename T , typename... CTorArguments> |
| constexpr | variant (const in_place_type< T > &type, CTorArguments &&... args) noexcept |
| | creates a variant and perform an in place construction of the type T. If T is not part of the variant you get a compiler error.
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| template<typename T , typename = std::enable_if_t<!std::is_same<std::decay_t<T>, variant>::value>, typename std::enable_if_t<!internal::is_in_place_index< std::decay_t< T > >::value, bool > = false, typename std::enable_if_t<!internal::is_in_place_type< std::decay_t< T > >::value, bool > = false> |
| constexpr | variant (T &&arg) noexcept |
| | creates a variant from a user supplied value
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| constexpr | variant (const variant &rhs) noexcept |
| | if the variant contains an element the elements copy constructor is called otherwise an empty variant is copied
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| constexpr variant & | operator= (const variant &rhs) noexcept |
| | if the variant contains an element the elements copy assignment operator is called otherwise an empty variant is copied
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| constexpr | variant (variant &&rhs) noexcept |
| | if the variant contains an element the elements move constructor is called otherwise an empty variant is moved
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| constexpr variant & | operator= (variant &&rhs) noexcept |
| | if the variant contains an element the elements move assignment operator is called otherwise an empty variant is moved
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| | ~variant () noexcept |
| | if the variant contains an element the elements destructor is called otherwise nothing happens
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| template<typename T > |
| std::enable_if<!std::is_same< T, variant< Types... > & >::value, variant< Types... > >::type & | operator= (T &&rhs) noexcept |
| | if the variant contains an element the elements assignment operator is called otherwise we have undefined behavior. It is important that you make sure that the variant really contains that type T.
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| template<uint64_t TypeIndex, typename... CTorArguments> |
| void | emplace_at_index (CTorArguments &&... args) noexcept |
| | calls the constructor of the type at index TypeIndex and perfectly forwards the arguments to this constructor. (not stl compliant)
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| template<typename T , typename... CTorArguments> |
| void | emplace (CTorArguments &&... args) noexcept |
| | calls the constructor of the type T and perfectly forwards the arguments to the constructor of T.
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| template<uint64_t TypeIndex> |
| internal::get_type_at_index< 0, TypeIndex, Types... >::type * | get_at_index () noexcept |
| | returns a pointer to the type stored at index TypeIndex. (not stl compliant)
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| template<uint64_t TypeIndex> |
| internal::get_type_at_index< 0, TypeIndex, Types... >::type * | unsafe_get_at_index_unchecked () noexcept |
| | returns a pointer to the type stored at index TypeIndex. (not stl compliant)
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| template<uint64_t TypeIndex> |
| const internal::get_type_at_index< 0, TypeIndex, Types... >::type * | get_at_index () const noexcept |
| | returns a pointer to the type stored at index TypeIndex. (not stl compliant)
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| template<uint64_t TypeIndex> |
| const internal::get_type_at_index< 0, TypeIndex, Types... >::type * | unsafe_get_at_index_unchecked () const noexcept |
| | returns a pointer to the type stored at index TypeIndex. (not stl compliant)
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| template<typename T > |
| const T * | get () const noexcept |
| | returns a pointer to the type T stored in the variant. (not stl compliant)
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| template<typename T > |
| T * | get () noexcept |
| | returns a pointer to the type T stored in the variant. (not stl compliant)
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| template<typename T > |
| T * | get_if (T *defaultValue) noexcept |
| | returns a pointer to the type T if its stored in the variant otherwise it returns the provided defaultValue
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| template<typename T > |
| const T * | get_if (const T *defaultValue) const noexcept |
| | returns a pointer to the type T if its stored in the variant otherwise it returns the provided defaultValue
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| constexpr uint64_t | index () const noexcept |
| | returns the index of the stored type in the variant. if the variant does not contain any type it returns INVALID_VARIANT_INDEX
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template<typename... Types>
class iox2::legacy::variant< Types >
Variant implementation from the C++17 standard with C++11. The interface is inspired by the C++17 standard but it has changes in get and emplace since we are not allowed to throw exceptions.
- Parameters
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| Types... | variadic list of types which the variant should be able to store |
#include <iostream>
{
}
{
}
Variant implementation from the C++17 standard with C++11. The interface is inspired by the C++17 sta...
void emplace(CTorArguments &&... args) noexcept
calls the constructor of the type T and perfectly forwards the arguments to the constructor of T.
#define IOX2_LOG(level, msg_stream)
Macro for logging.
constexpr bool always_false_v
Helper value to bind a static_assert to a type.
static constexpr uint64_t INVALID_VARIANT_INDEX
value which an invalid variant index occupies
Definition at line 101 of file variant.hpp.
1.9.8