diff options
Diffstat (limited to 'absl/flags/flag.h')
| -rw-r--r-- | absl/flags/flag.h | 24 |
1 files changed, 14 insertions, 10 deletions
diff --git a/absl/flags/flag.h b/absl/flags/flag.h index cc22cdb923..bd61668ff4 100644 --- a/absl/flags/flag.h +++ b/absl/flags/flag.h @@ -186,25 +186,29 @@ class Flag { // // // FLAGS_firstname is a Flag of type `std::string` // std::string first_name = absl::GetFlag(FLAGS_firstname); -template <typename T, - typename std::enable_if< - !flags_internal::IsAtomicFlagTypeTrait<T>::value, int>::type = 0> -ABSL_MUST_USE_RESULT T GetFlag(const absl::Flag<T>& flag) { - return flag.Get(); -} - +#ifndef NDEBUG // We want to validate the type mismatch between type definition and // declaration. The lock-free implementation does not allow us to do it, // so in debug builds we always use the slower implementation, which always // validates the type. -#ifndef NDEBUG +template <typename T> +ABSL_MUST_USE_RESULT T GetFlag(const absl::Flag<T>& flag) { + return flag.Get(); +} +// We currently need an external linkage for built-in types because shared +// libraries have different addresses of flags_internal::FlagOps<T> which +// might cause log spam when checking the same flag type. +#define ABSL_FLAGS_INTERNAL_BUILT_IN_EXPORT(T) \ + ABSL_MUST_USE_RESULT T GetFlag(const absl::Flag<T>& flag); +ABSL_FLAGS_INTERNAL_BUILTIN_TYPES(ABSL_FLAGS_INTERNAL_BUILT_IN_EXPORT) +#undef ABSL_FLAGS_INTERNAL_BUILT_IN_EXPORT +#else template <typename T, typename std::enable_if< - flags_internal::IsAtomicFlagTypeTrait<T>::value, int>::type = 0> + !flags_internal::IsAtomicFlagTypeTrait<T>::value, int>::type = 0> ABSL_MUST_USE_RESULT T GetFlag(const absl::Flag<T>& flag) { return flag.Get(); } -#else // Overload for `GetFlag()` for types that support lock-free reads. template <typename T, typename std::enable_if< |