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Workaround broken numeric_limits (#1725)

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This commit is contained in:
Victor Zverovich 2020-07-20 08:39:15 -07:00
parent c228bfe882
commit d39d661b18
1 changed files with 5 additions and 2 deletions
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7
include/fmt/format.h
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@ -291,6 +291,9 @@ template <typename T> constexpr T max_value() {
template <typename T> constexpr int num_bits() { template <typename T> constexpr int num_bits() {
return std::numeric_limits<T>::digits; return std::numeric_limits<T>::digits;
} }
// std::numeric_limits<T>::digits may return 0 for 128-bit ints.
template <> constexpr int num_bits<int128_t>() { return 128; }
template <> constexpr int num_bits<uint128_t>() { return 128; }
template <> constexpr int num_bits<fallback_uintptr>() { template <> constexpr int num_bits<fallback_uintptr>() {
return static_cast<int>(sizeof(void*) * return static_cast<int>(sizeof(void*) *
std::numeric_limits<unsigned char>::digits); std::numeric_limits<unsigned char>::digits);
@ -756,8 +759,8 @@ using uint32_or_64_or_128_t =
// represent all values of T. // represent all values of T.
template <typename T> template <typename T>
using uint32_or_64_or_128_t = conditional_t< using uint32_or_64_or_128_t = conditional_t<
std::numeric_limits<T>::digits <= 32, uint32_t, num_bits<T>() <= 32, uint32_t,
conditional_t<std::numeric_limits<T>::digits <= 64, uint64_t, uint128_t>>; conditional_t<num_bits<T>() <= 64, uint64_t, uint128_t>>;
#endif #endif
// Static data is placed in this class template for the header-only config. // Static data is placed in this class template for the header-only config.