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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 The Answer To LtUaE
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