[JSON] dirty code for building intrusive and non-intrusive…

tools/NlohmannMacroBuilder/main.cpp

+#include <cstdlib>
+#include <iostream>
+#include <sstream>
+#include "../../single_include/nlohmann/json.hpp"
+
+using namespace std;
+
+void build_code(int max_args)
+{
+    stringstream ss;
+    ss << "#define NLOHMANN_JSON_EXPAND( x ) x" << endl;
+    ss << "#define NLOHMANN_JSON_GET_MACRO(";
+    for (int i = 0 ; i < max_args ; i++)
+        ss << "_" << i + 1 << ", ";
+    ss << "NAME,...) NAME" << endl;
+    
+    ss << "#define NLOHMANN_JSON_PASTE(...) NLOHMANN_JSON_EXPAND(NLOHMANN_JSON_GET_MACRO(__VA_ARGS__, \\" << endl;
+    for (int i = max_args ; i > 1 ; i--)
+        ss << "NLOHMANN_JSON_PASTE" << i << ", \\" << endl;
+    ss << "NLOHMANN_JSON_PASTE1)(__VA_ARGS__))" << endl;
+    
+    ss << "#define NLOHMANN_JSON_PASTE2(func, v1) func(v1)" << endl;
+    for (int i = 3 ; i <= max_args ; i++)
+    {
+        ss << "#define NLOHMANN_JSON_PASTE" << i << "(func, "; 
+        for (int j = 1 ; j < i -1 ; j++)
+            ss << "v" << j << ", "; 
+        ss << "v" << i-1 << ") NLOHMANN_JSON_PASTE2(func, v1) NLOHMANN_JSON_PASTE" << i-1 << "(func, ";
+        for (int j = 2 ; j < i-1 ; j++)
+            ss << "v" << j << ", ";
+        ss << "v" << i-1 << ")" << endl;
+    }
+    
+    cout << ss.str() << endl;
+}
+
+struct example_struct
+{
+    int a;
+    int b;
+    int c;
+    int d;
+    int e;
+    int f;
+    int g;
+    int h;
+    int i;
+    int j;
+    int k;
+    int l;
+    int m;
+    int n;
+    int o;
+    int p;
+    int q;
+    int r;
+    int s;
+    int t;
+    int u;
+    int v;
+    int w;
+    int x;
+    int y;
+    int z;
+    NLOHMANN_DEFINE_TYPE_INTRUSIVE(example_struct, a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z)
+};
+
+void test_code()
+{
+    example_struct a;
+    nlohmann::json j = a;
+    cout << j << endl;
+}
+/*
+ * 
+ */
+int main(int argc, char** argv) 
+{
+    int max_args = 64;
+    build_code(max_args);
+//    test_code();
+       
+    return 0;
+}
+