How to Iterate Over a Struct in C Using Boost Fusion and Phoenix?

Iterating over a Struct in C

When working with structs in C , you may encounter the need to iterate over their individual members and extract their values. This can be achieved using various methods.

Using Boost Fusion/Phoenix

Boost Fusion and Phoenix libraries provide powerful tools for manipulating structs. Here's how you can iterate over a struct using these libraries:

<code class="cpp">#include <boost/fusion/adapted/struct.hpp>
#include <boost/fusion/include/for_each.hpp>
#include <boost/phoenix/phoenix.hpp>
using boost::phoenix::arg_names::arg1;</code>

<code class="cpp">struct A
{
    int a;
    int b;
    std::string c;
};</code>

To adapt the struct for use with Boost Fusion:

<code class="cpp">BOOST_FUSION_ADAPT_STRUCT(A, (int,a)(int,b)(std::string,c));</code>

In your print_struct_value function, you can now iterate over the struct as follows:

<code class="cpp">void print_struct_value(struct A a)
{
    boost::fusion::for_each(a, std::cout << arg1 << "\n");
}</code>

Output:

1
42
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