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Changes imported from Abseil "staging" branch:

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- d7810aa3eadf258776b9c4914df3b3db68791829 absl::optional<T>::value_or(U) now enforces copy/move by Matt Armstrong <marmstrong@google.com>
  - 3cc15e447c1851a91dd88e537e5f74faece605a3 Use ABSL_EXCEPTIONS_FLAG instead of -fexceptions in absl/... by Jon Cohen <cohenjon@google.com>

GitOrigin-RevId: d7810aa3eadf258776b9c4914df3b3db68791829
Change-Id: Ib40e22678944b633e734af790449871630f0eeab
This commit is contained in:
Abseil Team 2018-01-23 09:07:44 -08:00 • committed by John Olson
parent 787891a388
commit dcf112f074
2 changed files with 11 additions and 2 deletions
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8
absl/types/optional.h
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@ -849,12 +849,20 @@ class optional : private optional_internal::optional_data<T>,
// is empty.
template <typename U>
constexpr T value_or(U&& v) const& {
static_assert(std::is_copy_constructible<value_type>::value,
"optional<T>::value_or: T must by copy constructible");
static_assert(std::is_convertible<U&&, value_type>::value,
"optional<T>::value_or: U must be convertible to T");
return static_cast<bool>(*this)
? **this
: static_cast<T>(absl::forward<U>(v));
}
template <typename U>
T value_or(U&& v) && { // NOLINT(build/c++11)
static_assert(std::is_move_constructible<value_type>::value,
"optional<T>::value_or: T must by copy constructible");
static_assert(std::is_convertible<U&&, value_type>::value,
"optional<T>::value_or: U must be convertible to T");
return static_cast<bool>(*this) ? std::move(**this)
: static_cast<T>(std::forward<U>(v));
}