Intel® oneAPI DPC++/C++ Compiler Developer Guide and Reference

Development Reference Guides

Contents

ConstProxy

ConstProxy object provides access to a specific constant primitive, primitive data member, or nested data member within a primitive for an element in a container.
Description
const_accessor [index] or a ConstProxy object’s Data Member Interfaces return ConstProxy objects. That ConstProxy object represents the constant primitive, primitive data member, or nested data member within a primitive for an element in a container. The ConstProxy object has the following features:
  • A value_type can be exported or imported from the ConstProxy.
    • Conversion operator is used to export the value_type
    • Alternatively the ConstProxy can be passed to the function
      unproxy
       to export a
      value_type
  • 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
      • returns the result.
  • Data Member Interface.
    • For each data member of value_type
      • A member access method is defined which returns a Member ConstProxy representing just that member.
Member Type
Description 
typedef implementation-defined value_type
The type of the data the ConstProxy is representing
Member
Description 
operator value_type const () const;
Returns: exports a copy of the ConstProxy’s value.
NOTE: constant return value prevents rvalue assignment for structs offering some protection against code that expected a modifiable reference. 
auto name_of_values_data_member_1()const;
Returns: ConstProxy 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: ConstProxy 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: ConstProxy 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: ConstProxy 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

Product and Performance Information

1

Performance varies by use, configuration and other factors. Learn more at www.Intel.com/PerformanceIndex.