Declaration
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vector<int> v; // Size of 100 and initialize all to 0 vector<int> v(100, 0) // Reserve size of 3, to prevent extra complexity for copying v.reserve(3); |
Simple operation
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int n; v.push_back(n); |
Fill with something
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fill(v.begin(), v.end(), 101); |
Combine two vectors
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vector<int> head, tail; head.insert(head.end(), tail.begin(), tail.end()); |
In-place solution for creating object
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class Coord { private: int x, y; public: Coord(int x, int y) : x(x), y(y) {} }; |
Originally, object gets created first in the main stack and then copied to the vector’s memory address
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vector<Coord>v; Coord tmp(1, 2); v.push_back(tmp); |
In-place object creation can be achieved and save the computing time for copying the object
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vector<Coord>v; v.emplace_back(1, 2); // Pass the parameters of the constructor directly |