3rdParty/boost/1.78.0/libs/mpl/doc/refmanual/inherit-linearly.html
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template<
typename Types
, typename Node
, typename Root =[empty\_base](./empty-base.html)>
struct[inherit\_linearly](./inherit-linearly.html):[fold](./fold.html)<Types,Root,Node>
{
};
A convenience wrapper for fold to use in the context of sequence-driven class composition. Returns the result the successive application of binary Node to the result of the previous Node invocation (Root if it's the first call) and every type in the Forward Sequence Types in order.
#include <[boost/mpl/inherit\_linearly.hpp](../../../../boost/mpl/inherit_linearly.hpp)>
| Parameter | Requirement | Description |
|---|---|---|
| Types | Forward Sequence | Types to inherit from. |
| Node | Binary Lambda Expression | A derivation metafunction. |
| Root | A class type | A type to be placed at the root of the class hierarchy. |
For any Forward Sequence types, binary Lambda Expression node, and arbitrary class type root:
typedef[inherit\_linearly](./inherit-linearly.html)<types,node,root>::type r;
| Return type: |
A class type.
| | Semantics: |
Equivalent to
typedef[fold](./fold.html)<types,root,node>::type r;
|
Linear. Exactly size<types>::value applications of node.
template< typename T > struct tuple_field
{
T field;
};
template< typename T >
inline
T& field(tuple_field<T>& t)
{
return t.field;
}
typedef[inherit\_linearly](./inherit-linearly.html)<[vector](./vector.html)<int,char const*,bool>
,[inherit](./inherit.html)<[\_1](./placeholders.html), tuple_field<[\_2](./placeholders.html)> >
>::type tuple;
int main()
{
tuple t;
field<int>(t) = -1;
field<char const*>(t) = "text";
field<bool>(t) = false;
std::cout
<< field<int>(t) << 'n'
<< field<char const*>(t) << 'n'
<< field<bool>(t) << 'n'
;
}
Metafunctions, Algorithms, inherit, empty_base, fold, reverse_fold
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Copyright © 2001-2009 Aleksey Gurtovoy and David Abrahams Distributed under the Boost Software License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) |