[/
Copyright 2024 Glen Joseph Fernandes
(glenjofe@gmail.com)

Distributed under the Boost Software License, Version 1.0.
(http://www.boost.org/LICENSE_1_0.txt)
]

[section:pointer_in_range pointer_in_range]

[simplesect Authors]

* Glen Fernandes

[endsimplesect]

[section Overview]

The header <boost/core/pointer_in_range.hpp> provides the function template
`boost::pointer_in_range` to check if a pointer is in a given range. This
can be used in constant expressions in C++14 or higher when the compiler has a
builtin to support `std::is_constant_evaluated`.

[endsect]

[section Examples]

The following is an example of an allocator's deallocation function that does
nothing if the pointer falls within a small automatically allocated buffer.

```
template<class T, class N>
void
Allocator<T, N>::deallocate(pointer ptr, size_type)
{
    if (!boost::pointer_in_range(ptr, buffer_, buffer_ + N)) {
        ::operator delete(ptr);
    }
}
```

[endsect]

[section Reference]

```
namespace boost {

template<class T>
constexpr bool pointer_in_range(const T* ptr, const T* begin, const T* end);

} /* boost */
```

[section Functions]

[variablelist
[[`template<class T> constexpr bool pointer_in_range(const T* ptr,
const T* begin, const T* end);`]
[[variablelist
[[Requires][`[begin,end)` is a valid range.]]
[[Returns][`true` if `ptr` is in range `[begin,end)`, otherwise `false`.]]]]]]

[endsect]

[endsect]

[section Notes]

If `boost::pointer_in_range` is not usable in constant expressions the macro
`BOOST_CORE_NO_CONSTEXPR_POINTER_IN_RANGE` is defined.

[endsect]

[section History]

Glen Fernandes implemented `pointer_in_range`.

[endsect]

[endsect]