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T.13: for simple, single-type parameter concepts, it is better to use abbreviations

Reason (reason)

Readability. Direct expression of an idea.

Readability. Express your thoughts directly.

Example (using TS concepts) example (using TS concepts)

To say "T is Sortable":

To express "T is a sortable type":

Template / / Correct but verbose: "The parameter is

/ / requires Sortable / / of type T which is the name of a type

Void sort (T &); / / that is Sortable "

Template / / Better (assuming support for concepts): "The parameter is of type T

Void sort (T &); / / which is Sortable "

Void sort (Sortable&); / / Best (assuming support for concepts): "The parameter is Sortable"

The shorter versions better match the way we speak. Note that many templates don't need to use the template keyword.

The shorter version is more in line with what we want to express. Note that many templates do not need to use template keywords.

Note (Note)

"Concepts" are defined in an ISO Technical Specification: concepts. A draft of a set of standard-library concepts can be found in another ISO TS: ranges Concepts are supported in GCC 6.1 and later. Consequently, we comment out uses of concepts in examples; that is, we use them as formalized comments only. If you use a compiler that supports concepts (e.g., GCC 6.1 or later), you can remove the / /

The "concept" is defined in the ISO technical specification concepts. A preliminary version of a set of standard libraries concepts can be found in another ISO technical specification: ranges. GCC6.1 will support concepts in the future. So we comment out the parts that use concepts in the example code; that is, we just use them as standard comments. If you use a later version of GCC6.1, you can open the comments.

Enforcement (implementation recommendations)

Not feasible in the short term when people convert from the and notation.

If people turn from and notation, it is not appropriate to use abbreviations.

Later, flag declarations that first introduce a typename and then constrain it with a simple, single-type-argument concept.

Subsequently, the tag introduces the type name for the first time and immediately uses a simple, single-type concept to constrain it.

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