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Allow usage on platforms not providing iostreams #935

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Oct 28, 2020
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Allow usage on platforms not providing iostreams #935

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8 changes: 7 additions & 1 deletion include/gsl/pointers
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Original file line number Diff line number Diff line change
Expand Up @@ -20,11 +20,15 @@
#include <gsl/gsl_assert> // for Ensures, Expects

#include <algorithm> // for forward
#include <iosfwd> // for ptrdiff_t, nullptr_t, ostream, size_t
#include <cstddef> // for ptrdiff_t, nullptr_t, size_t
#include <memory> // for shared_ptr, unique_ptr
#include <system_error> // for hash
#include <type_traits> // for enable_if_t, is_convertible, is_assignable

#if !defined(GSL_NO_IOSTREAMS)
#include <iosfwd> // for ostream
#endif // !defined(GSL_NO_IOSTREAMS)

namespace gsl
{

Expand Down Expand Up @@ -116,12 +120,14 @@ auto make_not_null(T&& t) noexcept {
return not_null<std::remove_cv_t<std::remove_reference_t<T>>>{std::forward<T>(t)};
}

#if !defined(GSL_NO_IOSTREAMS)
template <class T>
std::ostream& operator<<(std::ostream& os, const not_null<T>& val)
{
os << val.get();
return os;
}
#endif // !defined(GSL_NO_IOSTREAMS)

template <class T, class U>
auto operator==(const not_null<T>& lhs, const not_null<U>& rhs) noexcept(noexcept(lhs.get() == rhs.get())) -> decltype(lhs.get() == rhs.get())
Expand Down