mirror of
https://github.com/triqs/dft_tools
synced 2024-11-01 03:33:50 +01:00
68 lines
1.8 KiB
ReStructuredText
68 lines
1.8 KiB
ReStructuredText
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.. _Move:
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Move and swap
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==================================
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Move
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------
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Every classes have proper move constructor and move assignment operators.
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Swap
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--------
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* swap and std::swap (equivalent) can be used to swap to array, array_view and so on.
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* swap just exchange the (shared) pointer to the data in memory,
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it does not affect the data them self.
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This distinction of importance for views in particular.
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* **Example** :
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.. compileblock::
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#include <triqs/arrays.hpp>
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#include <iostream>
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using triqs::arrays::vector; using triqs::arrays::range;
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int main () {
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triqs::arrays::vector<double> V(3), W(4);
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V() = 3; W()=4; // initialize
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auto VV = V(range (0,2));
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auto VW = W(range (0,2));
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std::cout << "V = "<< V << " W = " << W<< " V view "<< VV<< " W view "<< VW<< std::endl;
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swap(V,W);
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std::cout << "V = "<< V << " W = " << W<< " V view "<< VV<< " W view "<< VW<< std::endl;
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swap(VV,VW);
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std::cout << "V = "<< V << " W = " << W<< " V view "<< VV<< " W view "<< VW<< std::endl;
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}
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deep_swap
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--------------
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* deep_swap swaps the data in memory.
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* **Example** (compare with swap) :
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.. compileblock::
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#include <triqs/arrays.hpp>
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#include <iostream>
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using triqs::arrays::vector; using triqs::arrays::range;
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int main () {
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triqs::arrays::vector<double> V(3), W(3);
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V() = 3; W()=5; // initialize
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auto VV = V(range (0,2));
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auto VW = W(range (0,2));
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std::cout << "V = "<< V << " W = " << W<< " V view "<< VV<< " W view "<< VW<< std::endl;
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deep_swap(V,W);
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std::cout << "V = "<< V << " W = " << W<< " V view "<< VV<< " W view "<< VW<< std::endl;
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deep_swap(VV,VW);
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std::cout << "V = "<< V << " W = " << W<< " V view "<< VV<< " W view "<< VW<< std::endl;
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}
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