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dss:laboratoare:02 [2019/06/18 14:23] razvan.nitu1305 [1. Enum disassembly] |
dss:laboratoare:02 [2019/06/20 10:40] (current) razvan.nitu1305 [2. Generic Partitioning Search] |
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| Template constraints have the same syntax as an if statement (without else). | Template constraints have the same syntax as an if statement (without else). | ||
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| ===== Exercises ===== | ===== Exercises ===== | ||
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| + | The exercises for ''lab-02'' are located in this [[https://github.com/RazvanN7/D-Summer-School/tree/master/lab-02|repo]]. | ||
| ==== 1. Enum disassembly ==== | ==== 1. Enum disassembly ==== | ||
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| * The algorithm will receive an array/associative array and an element and returns the number of elements that are lesser than the element in the array/associative array list of keys. | * The algorithm will receive an array/associative array and an element and returns the number of elements that are lesser than the element in the array/associative array list of keys. | ||
| * The element type may be struct, class or builtin type. | * The element type may be struct, class or builtin type. | ||
| - | * Struct and builtin types have default ordering comparison, however classes do not. | ||
| * Use templated function(s) and **template constraints** or **static if**s to implement the various cases. | * Use templated function(s) and **template constraints** or **static if**s to implement the various cases. | ||
| * Use these [[https://dlang.org/phobos/std_traits.html|helper traits]]. | * Use these [[https://dlang.org/phobos/std_traits.html|helper traits]]. | ||
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| Use **pragma(msg)** inside the templated functions from the previous exercise. Observe the output when compiling the code. Explain the results. | Use **pragma(msg)** inside the templated functions from the previous exercise. Observe the output when compiling the code. Explain the results. | ||
| - | ==== 4. Unknown number of template arguments ==== | + | ==== 4. Template Sequence Parameters ==== |
| Navigate to the ''4-template'' directory. Inspect the source ''template.d'' and try to understand what happens. What does the code do? How many instances of the **printArguments** function are created? | Navigate to the ''4-template'' directory. Inspect the source ''template.d'' and try to understand what happens. What does the code do? How many instances of the **printArguments** function are created? | ||
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| <note hint> | <note hint> | ||
| Use **pragma(msg)** to inspect the instantiation type(s). | Use **pragma(msg)** to inspect the instantiation type(s). | ||
| - | </hint> | + | </note> |
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| + | ==== 5. Error ==== | ||
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| + | Navigate to the ''5-error'' directory. Inspect and compile the code. What happens? Why? Solve the issue. | ||
| + | ==== 6. Standard library template example ==== | ||
| + | Follow this [[https://github.com/dlang/phobos/blob/master/std/algorithm/sorting.d#L317|link]]. That is the official D language standard library implementation of the **ordered** function. Read the documentation and the unittests, then try to understand the implementation. This is how real life meta-programming looks like. Ask the [[http://ocw.cs.pub.ro/courses/dss?&#team|lab rats]] about clarifications on any misunderstandings. | ||
