Boost C++ Libraries

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This is an older version of Boost and was released in 2023. The current version is 1.89.0.

mpl sequence

mpl sequence

This module provides adapters for MPL sequences. Including the module header makes all MPL sequences fully conforming fusion sequences.

Header

#include <boost/fusion/adapted/mpl.hpp>
#include <boost/fusion/include/mpl.hpp>

Model of

Forward Sequence (If the MPL sequence is a forward sequence.)
Bidirectional Sequence (If the MPL sequence is a bidirectional sequence.)
Random Access Sequence (If the MPL sequence is a random access sequence.)

Example

mpl::vector_c<int, 123, 456> vec_c;
fusion::vector2<int, long> v(vec_c);
std::cout << at_c<0>(v) << std::endl;
std::cout << at_c<1>(v) << std::endl;

v = mpl::vector_c<int, 456, 789>();
std::cout << at_c<0>(v) << std::endl;
std::cout << at_c<1>(v) << std::endl;

Bi-directional adaptation

Fusion sequences may also be adapted as fully conforming MPL sequences (see Intrinsics). That way, we can have 2-way adaptation to and from MPL and Fusion. To make Fusion sequences fully conforming MPL sequences, include:

#include <boost/fusion/mpl.hpp>

If you want bi-directional adaptation to and from MPL and Fusion, simply include:

#include <boost/fusion/include/mpl.hpp>

The header includes all the necessary headers.

See also