src/include/clapp/main_parser.h: inherit constructors from basic_parser_t

doc/doc.md

@@ -485,7 +485,7 @@ Thus, by simply passing around a reference (or a pointer) to this main parser, a
 arguments or option can be be accessed easily.
 
 ### Main parser construction:
-The main-parser base class `clapp::parser::basic_main_parser_t` contains only one constructor.
+The main-parser base class `clapp::parser::basic_main_parser_t` inherits its constructors from its base-class `clapp::parser::basic_parser_t`.
 This constructor has no arguments, but since it is a base-class, you can extend it easily by
 your derived class. See the listing below for an example.
 

src/clapp/main_parser.cpp

@@ -16,8 +16,6 @@
 #include <clapp/exception.h>
 #include <clapp/main_parser.h>
 
-clapp::parser::basic_main_parser_t::basic_main_parser_t() = default;
-
 clapp::parser::basic_main_parser_t::~basic_main_parser_t() = default;
 
 clapp::parser::basic_main_parser_t::operator bool() const {

src/include/clapp/main_parser.h

@@ -23,7 +23,7 @@ namespace clapp {
 inline namespace parser {
 class basic_main_parser_t : public basic_parser_t {
    public:
-    basic_main_parser_t();
+    using basic_parser_t::basic_parser_t;
     ~basic_main_parser_t() override;
 
     // TODO(martinw): enable, if basic_parser has implemented this too