Merge commit 'b9112977b074d67d6c83f04af36b6dabdf1d92c6' as 'external/json'

external/json/docs/examples/get_allocator.cpp

@@ -0,0 +1,18 @@
+#include <iostream>
+#include <nlohmann/json.hpp>
+
+using json = nlohmann::json;
+
+int main()
+{
+    auto alloc = json::get_allocator();
+    using traits_t = std::allocator_traits<decltype(alloc)>;
+
+    json* j = traits_t::allocate(alloc, 1);
+    traits_t::construct(alloc, j, "Hello, world!");
+
+    std::cout << *j << std::endl;
+
+    traits_t::destroy(alloc, j);
+    traits_t::deallocate(alloc, j, 1);
+}