std::unordered_map::operator= - cppreference.com
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(1) | (desde C++11) |
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(2) | (desde C++11) |
Substitui o conteúdo do recipiente.
Original:
Replaces the contents of the container.
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1)
Copiar operador de atribuição. Substitui o conteúdo com uma cópia do conteúdo do other.
Original:
Copy assignment operator. Replaces the contents with a copy of the contents of other.
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2)
Mova operador de atribuição. Substitui o conteúdo com as de other usando semântica de movimento (ou seja, os dados em other é movido de other neste recipiente). other está em estado válido, mas não especificada depois.
Original:
Move assignment operator. Replaces the contents with those of other using move semantics (i.e. the data in other is moved from other into this container). other is in valid, but unspecified state afterwards.
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Parâmetros
| other | - | um outro recipiente, para ser usado como fonte Original: another container to be used as source The text has been machine-translated via Google Translate. |
Valor de retorno
*this
Complexidade
1)
Linear no tamanho do recipiente.
Original:
Linear in the size of the container.
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2)
Constante.
Original:
Constant.
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Exemplo
O código a seguir usa para atribuir um std::unordered_map para outro:
Original:
The following code uses to assign one std::unordered_map to another:
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#include <unordered_map> #include <iostream> void display_sizes(const std::unordered_map<int, int> &nums1, const std::unordered_map<int, int> &nums2, const std::unordered_map<int, int> &nums3) { std::cout << "nums1: " << nums1.size() << " nums2: " << nums2.size() << " nums3: " << nums3.size() << '\n'; } int main() { std::unordered_map<int, int> nums1 {{3, 1}, {4, 1}, {5, 9}}; std::unordered_map<int, int> nums2; std::unordered_map<int, int> nums3; std::cout << "Initially:\n"; display_sizes(nums1, nums2, nums3); // copy assignment copies data from nums1 to nums2 nums2 = nums1; std::cout << "After assigment:\n"; display_sizes(nums1, nums2, nums3); // move assignment moves data from nums1 to nums3, // modifying both nums1 and nums3 nums3 = std::move(nums1); std::cout << "After move assigment:\n"; display_sizes(nums1, nums2, nums3); }
Saída:
Initially: nums1: 4 nums2: 0 nums3: 0 After assigment: nums1: 4 nums2: 4 nums3: 0 After move assigment: nums1: 0 nums2: 4 nums3: 4
Veja também
constrói o Original: constructs the The text has been machine-translated via Google Translate. (função pública membro) [edit] | |