Intel® C++ Compiler 16.0 User and Reference Guide
Proxy object provides access to a specific Primitive, Primitive data member, or nested data member within a Primitive for an element in a container.
accessor [index] or a Proxy object’s Data Member Interfaces return Proxy objects. That Proxy object represents the Primitive, Primitive data member, or nested data member within a Primitive for an element in a container. The Proxy object has the following features:
A value_type can be exported or imported from the Proxy.
Conversion operator is used to export the value_type
Alternatively the Proxy can be passed to the function unproxy to export a value_type
Assignment operator = is used to import value_type into the Proxy
Overloads the following operators if the underlying value_type supports the operator
==, !=, <, >, <=, >=, +, -, *, /, %, &&, ||, &, |, ^, ~, *, +, -, !, +=, -=, *=, /=, %=, >>=, <<=, &=, |=, ^=, ++, --
When an operator is called the following occurs:
value_type is exported
The operator applied to the exported value
If the operator was an assignment, the result is imported back into the Member and returns the proxy
Otherwise a result is returned.
Data Member Interface.
For each data member of value_type
A member access method is defined which returns a Member proxy representing just that member.
|
Member Type |
Description |
|---|---|
typedef implementation-defined value_type |
The type of the data the Proxy is representing |
|
Member |
Description |
|---|---|
operator value_type const () const; |
Returns: exports a copy of the Proxy’s value. NOTE: constant return value prevents rvalue assignment for structs offering some protection against code that expected a modifiable reference. |
const value_type & operator = (const value_type &a_value); |
Imports a_value into container at the position the Proxy is representing. Returns: the same constant value_type it was passed. NOTE: This behavior is different from traditional assignment operators that return *this. Choice was to enable efficient chaining of assignment operators versus returning a Proxy which would have to export the value it had just imported. |
Proxy & operator = (const Proxy &other); |
Exports value from the other Proxy and imports it. Returns: A reference to this Proxy obect. |
auto name_of_values_data_member_1()const; |
Returns: Proxy instance representing the 1st data member of the value_type NOTE: actual method name is the name of the value_type’s 1st data member |
auto name_of_values_data_member_2()const; |
Returns: Proxy instance representing the 2nd data member of the value_type. NOTE: actual method name is the name of the value_type’s 2nd data member. |
auto name_of_values_data_member_...()const; |
Returns: Proxy instance representing the ...th data member of the value_type. NOTE: actual method name is the name of the value_type’s …th data member. |
auto name_of_values_data_member_N()const; |
Returns: Proxy instance representing the Nth data member of the value_type. NOTE: actual method name is the name of the value_type’s Nth data member |