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What is meant by this C++ statement?
vector<int>::size_type x; And, what is the use of the scope operator :: here? In other words, how do we read this statement in English?
For example, for X::x(){...}, we say that x() is a member function of class X.
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size_type is a (static) member type of the type vector<int> . Usually, it is a typedef for std::size_t , which itself is usually a typedef for unsigned int or unsigned long long .
size() – Returns the number of elements in the vector. max_size() – Returns the maximum number of elements that the vector can hold. capacity() – Returns the size of the storage space currently allocated to the vector expressed as number of elements.
size_t is defined as the type used for the size of an object and is platform dependent. container::size_type is the type that is used for the number of elements in the container and is container dependent.
This is because vector. size() returns a size_t type value, which is an alias for unsigned long int .
size_type is a (static) member type of the type vector<int>. Usually, it is a typedef for std::size_t, which itself is usually a typedef for unsigned int or unsigned long long.
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