Class expression_handle¶

`class` expression_handle<T, Dims> base ¶

template <typename T, index_t Dims = 1>
struct expression_handle { … }

Opaque type-erased handle to an expression (forward declaration).

See also: expression_handle

`variable` instance ¶

void* instance

Pointer to the concrete expression instance.

Fully qualified name: kfr::expression_handle<T, Dims>::instance

Declared at base/handle.hpp:245

`variable` vtable ¶

const expression_vtable<T, Dims>* vtable

Pointer to the static vtable for the instance type.

Fully qualified name: kfr::expression_handle<T, Dims>::vtable

Declared at base/handle.hpp:246

`variable` resource ¶

std::shared_ptr<expression_resource> resource

Owning resource, or null for a non-owning handle.

Fully qualified name: kfr::expression_handle<T, Dims>::resource

Declared at base/handle.hpp:247

`constructor` expression_handle<T, Dims>() ¶

expression_handle() noexcept

Construct an empty (invalid) handle.

Fully qualified name: kfr::expression_handle<T, Dims>::expression_handle<T, Dims>()

Declared at base/handle.hpp:250

`constructor` expression_handle<T, Dims>(const void , const expression_vtable<T, Dims> , std::shared_ptr<expression_resource>) ¶

expression_handle(const void* instance, const expression_vtable<T, Dims>* vtable,
                  std::shared_ptr<expression_resource> resource = nullptr)

Construct a handle referencing instance with vtable vtable.

Parameters
instance	Pointer to the concrete expression instance (not owned unless `resource` is set).
vtable	Vtable for the instance type.
resource	Optional owning resource; when set the handle keeps the instance alive.

Fully qualified name: kfr::expression_handle<T, Dims>::expression_handle<T, Dims>(const void *, const expression_vtable<T, Dims> *, std::shared_ptr<expression_resource>)

Declared at base/handle.hpp:255

`operator` operator bool() ¶

explicit operator bool() const

true if the handle references a valid instance.

Fully qualified name: kfr::expression_handle<T, Dims>::operator bool()

Declared at base/handle.hpp:262

`function` substitute(expression_handle<T, Dims>) ¶

bool substitute(expression_handle<T, Dims> new_handle)

Replace the placeholder inside the referenced expression with new_handle.

Parameters
new_handle	Handle to substitute into the placeholder slot.

Returns
	`true` if a placeholder was found and substituted.

See also: substitute(expression_handle&, expression_handle, csize_t)

Fully qualified name: kfr::expression_handle<T, Dims>::substitute(expression_handle<T, Dims>)

Declared at base/handle.hpp:268

Fully qualified name: kfr::expression_handle<T, Dims>

Declared at base/handle.hpp:243

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Class expression_handle¶