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Tip of the Day
Home » Tip Bank » C++
Language: C++
Expertise: Advanced
Jun 4, 1998



Application Security Testing: An Integral Part of DevOps

A template's template argument

Standard C++ supports templates' template arguments. For instance, a mail server class can store incoming messages in a vector of vector(s) of bytes:
	vector< vector<unsigned char> > vmessages;
Please note that the space between the left two angular brackets is mandatory. Otherwise, a >> sequence is parsed as the right shift operator. The same is true, of course, for a << sequence, so a typedef can be used to improve readability both for the compiler and the human reader:
	typedef  vector<unsigned char> msg;
	vector<msg> vmessages;
Danny Kalev
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