<snippet>
    <content><![CDATA[
#ifndef ${1}
#define ${1}

${2}

#endif // ${1}
]]></content>
    <!-- Optional: Set a tabTrigger to define how to trigger the snippet -->
    <tabTrigger>header</tabTrigger>
    <!-- Optional: Set a scope to limit where the snippet will trigger -->
    <scope>source.c++</scope>
</snippet>