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[range.take.while.overview]

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  #### Overview <a id="range.take.while.overview">[[range.take.while.overview]]</a>
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- Given a unary predicate `pred` and a `view` `r`, `take_while_view`
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- produces a `view` of the range \[`begin(r)`,
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  `ranges::find_if_not(r, pred)`).
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  The name `views::take_while` denotes a range adaptor object
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  [[range.adaptor.object]]. Given subexpressions `E` and `F`, the
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  expression `views::take_while(E, F)` is expression-equivalent to
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- `take_while_view{E, F}`.
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  [*Example 1*:
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  ``` cpp
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  auto input = istringstream{"0 1 2 3 4 5 6 7 8 9"};
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  auto small = [](const auto x) noexcept { return x < 5; };
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- auto small_ints = istream_view<int>(input) | views::take_while(small);
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  for (const auto i : small_ints) {
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  cout << i << ' '; // prints 0 1 2 3 4
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  }
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  auto i = 0;
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  input >> i;
 
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  #### Overview <a id="range.take.while.overview">[[range.take.while.overview]]</a>
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+ Given a unary predicate `pred` and a view `r`, `take_while_view`
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+ produces a view of the range \[`ranges::begin(r)`,
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  `ranges::find_if_not(r, pred)`).
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  The name `views::take_while` denotes a range adaptor object
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  [[range.adaptor.object]]. Given subexpressions `E` and `F`, the
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  expression `views::take_while(E, F)` is expression-equivalent to
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+ `take_while_view(E, F)`.
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  [*Example 1*:
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  ``` cpp
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  auto input = istringstream{"0 1 2 3 4 5 6 7 8 9"};
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  auto small = [](const auto x) noexcept { return x < 5; };
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+ auto small_ints = views::istream<int>(input) | views::take_while(small);
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  for (const auto i : small_ints) {
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  cout << i << ' '; // prints 0 1 2 3 4
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  }
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  auto i = 0;
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  input >> i;