/usr/share/kdevcodegen/templates/method_definition_cpp.txt is in kdevelop-data 4:5.0.3-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | {% with method.arguments as arguments %}
{% if not method.isConstructor and not method.isDestructor %}{{ method.returnType|default:"void" }} {% endif %}{{ name }}::{% if method.isConstructor %}{{ name }}{% else %}{{ method.name }}{% endif %}({% include "arguments_types_names.txt" %}){% if method.isConst %} const{% endif %}
{% endwith %}
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