
Category: containers  Component type: concept 
X  A type that is a model of Random Access Container 
a, b  Object of type X 
T  The value type of X 
Name  Expression  Type requirements  Return type 

Element access  a[n]  n is convertible to size_type  reference if a is mutable, const_reference otherwise 
Name  Expression  Precondition  Semantics  Postcondition 

Element access  a[n]  0 <= n < a.size()  Returns the nth element from the beginning of the container. 
Element access  The element returned by a[n] is the same as the one obtained by incrementing a.begin() n times and then dereferencing the resulting iterator. 
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