Has the semantics of const_cast<const basic_json&>(*this).begin().
Example\n The following code shows an example for cbegin(). \n @includelineno cbegin.cpp \n Output (play with this example @htmlinclude cbegin.link):\n @verbinclude cbegin.output \n The example code above can be translated with @verbatim g++ -std=c++11 -Isrc doc/examples/cbegin.cpp -o cbegin @endverbatim