How to Iterate Over a Struct\'s Members in C Using Boost Fusion and Phoenix?

Iterating Over a Struct's Members in C

Given a struct definition:

<code class="c++">typedef struct A
{
    int a;
    int b;
    char * c;
} aA;</code>

we can iterate over its members and print their values using techniques like Boost Fusion/Phoenix.

Using Boost Fusion, we can adapt the struct for fusion:

<code class="c++">#include <boost/fusion/adapted/struct.hpp>
BOOST_FUSION_ADAPT_STRUCT(A, (int, a)(int, b)(std::string, c));</code>

And then iterate over its members using Boost Phoenix:

<code class="c++">#include <boost/phoenix/phoenix.hpp>
using boost::phoenix::arg_names::arg1;

void print_struct_value(A const& obj)
{
    boost::fusion::for_each(obj, std::cout << arg1 << "\n");
}</code>

An example usage:

<code class="c++">int main()
{
    const A obj = { 1, 42, "The Answer To LtUaE" };
    print_struct_value(obj);
}</code>

This will output the member values:

1
42
The Answer To LtUaE

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