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std::vector::capacity(3) C++ Standard Libary std::vector::capacity(3) NAME std::vector::capacity - std::vector::capacity Synopsis size_type capacity() const; (until C++11) size_type capacity() const noexcept; (since C++11) (until C++20) constexpr size_type capacity() const noexcept; (since C++20) Returns the number of elements that the container has currently al- located space for. Parameters (none) Return value Capacity of the currently allocated storage. Complexity Constant. Example // Run this code #include <iomanip> #include <iostream> #include <vector> int main() { int sz = 100; std::vector<int> v; auto cap = v.capacity(); std::cout << "Initial size: " << v.size() << ", capacity: " << cap << '\n'; std::cout << "\nDemonstrate the capacity's growth policy." "\nSize: Capacity: Ratio:\n" << std::left; while (sz-- > 0) { v.push_back(sz); if (cap != v.capacity()) { std::cout << std::setw( 7) << v.size() << std::setw(11) << v.capacity() << std::setw(10) << v.capacity() / sta- tic_cast<float>(cap) << '\n'; cap = v.capacity(); } } std::cout << "\nFinal size: " << v.size() << ", capacity: " << v.capacity() << '\n'; } Possible output: Initial size: 0, capacity: 0 Demonstrate the capacity's growth policy. Size: Capacity: Ratio: 1 1 inf 2 2 2 3 4 2 5 8 2 9 16 2 17 32 2 33 64 2 65 128 2 Final size: 100, capacity: 128 See also size returns the number of elements (public member function) reserve reserves storage (public member function) http://cppreference.com 2022.07.31 std::vector::capacity(3)
NAME | Synopsis | Parameters | Return value | Complexity | Example | Possible output: | See also
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