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Mark finally with nodiscard attribute.

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The compiler should warn about unsued result of finally().
See https://github.com/Microsoft/GSL/issues/284.
This commit is contained in:
Paweł Bylica 2016-04-08 13:16:15 +02:00
parent a9f865900d
commit d947c740ee
1 changed files with 9 additions and 2 deletions
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11
include/gsl_util.h
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@ -78,13 +78,20 @@ private:
bool invoke_; bool invoke_;
}; };
// C++17 [[nodiscard]] attribute for legacy compilers.
#if _MSC_VER
#define GSL_NODISCARD _Check_return_
#else
#define GSL_NODISCARD __attribute__((warn_unused_result))
#endif
// finally() - convenience function to generate a final_act // finally() - convenience function to generate a final_act
template <class F> template <class F>
inline final_act<F> finally(const F &f) GSL_NODISCARD inline final_act<F> finally(const F &f)
noexcept { return final_act<F>(f); } noexcept { return final_act<F>(f); }
template <class F> template <class F>
inline final_act<F> finally(F &&f) noexcept GSL_NODISCARD inline final_act<F> finally(F &&f) noexcept
{ return final_act<F>(std::forward<F>(f)); } { return final_act<F>(std::forward<F>(f)); }
// narrow_cast(): a searchable way to do narrowing casts of values // narrow_cast(): a searchable way to do narrowing casts of values