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span, doc: provide span.h context and explain lifetimebound definition

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Jon Atack 2021-09-23 17:22:15 +02:00
parent d14395bc5d
commit 33c6a208a9
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1 changed files with 6 additions and 2 deletions
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src/span.h
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@ -30,7 +30,11 @@
/** A Span is an object that can refer to a contiguous sequence of objects.
*
* It implements a subset of C++20's std::span.
* This file implements a subset of C++20's std::span. It can be considered
* temporary compatibility code until C++20 and is designed to be a
* self-contained abstraction without depending on other project files. For this
* reason, Clang lifetimebound is defined here instead of including
* <attributes.h>, which also defines it.
*
* Things to be aware of when writing code that deals with Spans:
*
@ -60,7 +64,7 @@
* types that expose a data() and size() member function), functions that
* accept a Span as input parameter can be called with any compatible
* range-like object. For example, this works:
*
*
* void Foo(Span<const int> arg);
*
* Foo(std::vector<int>{1, 2, 3}); // Works