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C preprocessor
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====Token concatenation==== The '''token pasting operator''', denoted by <code>##</code>, concatenates two tokens into one. For definition: <syntaxhighlight lang="cpp"> #define DECLARE_STRUCT_TYPE(name) typedef struct name##_s name##_t </syntaxhighlight> <code>DECLARE_STRUCT_TYPE(g_object)</code> expands to <code>typedef struct g_object_s g_object_t</code>.
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