Revision: 9748
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at November 19, 2008 22:02 by jimfred
Initial Code
VECTOR (Variable sized array/stack with built in memory allocation)
vector<int> a(10); // a[0]..a[9] are int (default size is 0)
a.size(); // Number of elements (10)
a.push_back(3); // Increase size to 11, a[10]=3
a.back()=4; // a[10]=4;
a.pop_back(); // Decrease size by 1
a.front(); // a[0];
a[20]=1; // Crash: not bounds checked
a.at(20)=1; // Like a[20] but throws out_of_range()
for (vector<int>::iterator p=a.begin(); p!=a.end(); ++p)
*p=0; // Set all elements of a to 0
vector<int> b(a.begin(), a.end()); // b is copy of a
vector<T> c(n, x); // c[0]..c[n-1] init to x
T d[10]; vector<T> e(d, d+10); // e is initialized from d
DEQUE (array/stack/queue)
deque<T> is like vector<T>, but also supports:
a.push_front(x); // Puts x at a[0], shifts elements toward back
a.pop_front(); // Removes a[0], shifts toward front
UTILITY (Pair)
pair<string, int> a("hello", 3); // A 2-element struct
a.first; // "hello"
a.second; // 3
MAP (associative array)
map<string, int> a; // Map from string to int
a["hello"]=3; // Add or replace element a["hello"]
for (map<string, int>::iterator p=a.begin(); p!=a.end(); ++p)
cout << (*p).first << (*p).second; // Prints hello, 3
a.size(); // 1
Initial URL
http://www.sourcepole.com/sources/programming/cpp/cppqref.html
Initial Description
Initial Title
C++ template quick reference
Initial Tags
template, array
Initial Language
C++