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This article introduces the knowledge of "what is C++ minimization template's dependence on context". Many people will encounter this dilemma in the operation of actual cases. then let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

T.60: minimize the template's dependency on context

Reason (reason)

Eases understanding. Minimizes errors from unexpected dependencies. Eases tool creation.

Make it easier to understand. Minimize errors caused by unexpected dependencies. Facilitate tool generation.

Example (sample)

Template

Void sort (C & c)

{

Std::sort (begin (c), end (c)); / / necessary and useful dependency

}

Template

Iter algo (Iter first, Iter last)

{

For (; first! = last; + + first) {

Auto x = sqrt (* first); / / potentially surprising dependency: which sqrt ()?

Helper (first, x); / / potentially surprising dependency:

/ / helper is chosen based on first and x

TT var = 7; / / potentially surprising dependency: which TT?

}

} Note (note)

Templates typically appear in header files so their context dependencies are more vulnerable to # include order dependencies than functions in .cpp files.

Templates usually appear in header files, and their context dependencies are more likely to be affected by the # include order than in CPP files.

Note (Note)

Having a template operate only on its arguments would be one way of reducing the number of dependencies to a minimum, but that would generally be unmanageable. For example, algorithms usually use other algorithms and invoke operations that do not exclusively operate on arguments. And don't get us started on macros!

Letting template operations only manipulate parameters is a way to minimize the number of dependencies. But that's usually not possible. For example, algorithms typically use other algorithms and invoke operations that cannot be exclusive to parameters.

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