Revert "[clang-tidy] Use default to initialize constructors"

This reverts commit bf40ea8816.

src/CLI2.cpp

@@ -49,10 +49,21 @@ A2::A2 (const std::string& raw, Lexer::Type lextype)
 }
 
 ////////////////////////////////////////////////////////////////////////////////
-A2::A2 (const A2& other) = default;
+A2::A2 (const A2& other)
+: _lextype (other._lextype)
+, _tags (other._tags)
+, _attributes (other._attributes)
+{
+}
 
 ////////////////////////////////////////////////////////////////////////////////
-A2& A2::operator= (const A2& other) = default;
+A2& A2::operator= (const A2& other)
+{
+  _lextype    = other._lextype;
+  _tags       = other._tags;
+  _attributes = other._attributes;
+  return *this;
+}
 
 ////////////////////////////////////////////////////////////////////////////////
 bool A2::hasTag (const std::string& tag) const

src/Lexer.cpp

@@ -50,7 +50,9 @@ Lexer::Lexer (const std::string& text)
 }
 
 ////////////////////////////////////////////////////////////////////////////////
-Lexer::~Lexer () = default;
+Lexer::~Lexer ()
+{
+}
 
 ////////////////////////////////////////////////////////////////////////////////
 // When a Lexer object is constructed with a string, this method walks through

src/Variant.cpp

@@ -166,7 +166,19 @@ const std::string& Variant::source () const
 }
 
 ////////////////////////////////////////////////////////////////////////////////
-Variant& Variant::operator= (const Variant& other) = default;
+Variant& Variant::operator= (const Variant& other)
+{
+  _type     = other._type;
+  _bool     = other._bool;
+  _integer  = other._integer;
+  _real     = other._real;
+  _string   = other._string;
+  _date     = other._date;
+  _duration = other._duration;
+  _source   = other._source;
+
+  return *this;
+}
 
 ////////////////////////////////////////////////////////////////////////////////
 bool Variant::operator&& (const Variant& other) const