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58 lines
2.6 KiB
ReStructuredText
58 lines
2.6 KiB
ReStructuredText
.. highlight:: c
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Assignment
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=========================
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The `value classes` and the `view classes` have a quite general assignment operator.
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We will illustrate it on the `array` class, it is the same for `matrix` and `vector`.
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* **Syntax** : the syntax is the same in both cases::
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template<typename RHS> array & operator=(const RHS & X);
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template<typename RHS> array_view & operator=(const RHS & X);
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* **What can be RHS ?**
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RHS can be ... anything that models the :ref:`ImmutableCuboidArray` concept !
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e.g. : array, array_view, matrix, matrix_view,
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but also formal expression (See , e.g. A+B), or any custom object of your choice.
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* **Behaviour**
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================= ======================================================================= ======================================================================================
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Topic value class : array, matrix, vector view: array_view, matrix_view, vector_view
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================= ======================================================================= ======================================================================================
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RHS ... - RHS models the concept :ref:`ImmutableCuboidArray`. - RHS models :ref:`ImmutableCuboidArray`
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[or less ? : RHS can be evaluated in the domain_type::value_type, no domain needed.].
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Effect - array is resized to have a domain X.domain() - View's domain must match X's domain or behaviour is undefined.
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- array is filled with the evaluation of X. - array is filled with the evaluation of X.
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================= ======================================================================= ======================================================================================
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* By evaluation of X, we mean :
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- a copy if X is an array.
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- computing the value if X is an expression.
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Compound operators (+=, -=, * =, /=)
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-------------------------------------------------
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* **Syntax**
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The syntax is natural ::
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template<typename RHS> array & operator += (const RHS & X);
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template<typename RHS> array & operator -= (const RHS & X);
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template<typename RHS> array & operator *= (const Scalar & S);
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template<typename RHS> array & operator /= (const Scalar & S);
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* **What can be RHS ?**
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Same as for = operator.
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* **Behaviour**
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Similar to for = operator, with obvious changes.
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