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std::valarray::resize

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std::valarray
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void resize( std::size_t count, T value = T() );
valarray count.
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Resizes the valarray to contain count elements.
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, count, value.
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If the current size is less than count, additional elements are appended and initialized with value.
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count, valarray count.
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If the current size is greater than count, the valarray is reduced to its first count elements.
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count
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new size of the container
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value
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the value to initialize the new elements with
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valarray
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