/usr/share/kdevcodegen/templates/class_declaration_cpp.txt is in kdevelop-data 4:5.2.1-1ubuntu4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 | class {{ name }}{% if base_classes %} :{% for base in base_classes %} {{ base.inheritanceMode }} {{ base.baseType }}{% if not forloop.last %}, {% endif %}{% endfor %}{% endif %}
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