std::queue swap()

od C++11

// Non const version only
void swap( priority_queue& other ) noexcept(/* see below*/);

Exchanges the contents of the container adaptor with those of other.

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Effectively does:

using std::swap;
swap(c, other.c);

Parameters

• other - container adaptor to exchange the contents with

Return valued

(none)

Exceptions

od C++17

noexcept specification:

noexcept(std::is_nothrow_swappable_v<Container> &&
         std::is_nothrow_swappable_v<Compare>)

od C++11

noexcept specification:

noexcept(noexcept(swap(c, other.c)) && noexcept(swap(comp, other.comp)))

In the expression above, the identifier swap is looked up in the same manner as the one used by the C++17 std::is_nothrow_swappable trait.

Complexity

Equivalent to that of swap of the underlying container.

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For standard containers the complexity is guaranteed to be:

• Linear in the size of the container - O(size()), for std::array.
• Constant - O(1), for all other containers.

Notes

Some implementations (e.g. libc++) provide the swap member function as an extension to pre-C++11 modes.

Example

important

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