/usr/share/kdevcodegen/templates/namespace_open_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 2 3 | {% for ns in namespaces %}
namespace {{ ns }} {% templatetag openbrace %}
{% endfor %}
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