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A first general restructuration of the doc according to the pattern [tour|tutorial|reference]. In the reference part, objects are documented per topic. In each topic, [definition|c++|python|hdf5] (not yet implemented)
54 lines
1.5 KiB
ReStructuredText
54 lines
1.5 KiB
ReStructuredText
.. highlight:: c
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Overloading functions and methods for CLEF arguments
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=====================================================
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.. _overload_function:
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Overloading functions
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----------------------------
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Given a function, it is possible to overload it for CLEF expression arguments, returning a CLEF expression
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using the `TRIQS_CLEF_MAKE_FNT_LAZY` macro.
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**Synopsis** ::
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namespace triqs { namespace clef {
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TRIQS_CLEF_MAKE_FNT_LAZY (function_to_make_lazy);
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}}
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For example:
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.. triqs_example:: ./overload_0.cpp
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Note that:
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* This overload **must** be defined in the triqs::clef namespace, since it is found by ADL.
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* The function `foo` can have many overloads.
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* The function `bar` can be a template, BUT then the template must be disabled for lazy expressions.
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* The overload is already defined by clef for usual functions:
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.. triqs_example:: ./overload_1.cpp
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.. _callable_object:
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Overloading operator() and other methods
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---------------------------------------------------
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Similarly to functions, classes can define an `operator()` for CLEF expressions arguments (or any other method).
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It is an ordinary operator() that must:
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* Be enabled only when one argument is a CLEF expression
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* Return a CLEF expression.
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Example:
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.. triqs_example:: ./overload_2.cpp
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**NB** When the method or the non CLEF operator() is already a template,
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it must be disabled for clef expression argument, using the trait ::
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clef::is_clef_expression<T...> // true iif one of the T is a clef expression
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as the `bar` function above.
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