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Fix UBSAN warning

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This commit is contained in:
Victor Zverovich 2019-03-22 07:42:57 -07:00
parent b7e6bf9671
commit 91acfe6852
1 changed files with 10 additions and 1 deletions
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11
include/fmt/format.h
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@ -557,13 +557,22 @@ extern template int char_traits<wchar_t>::format_float<long double>(
long double value); long double value);
#endif #endif
// A workaround for std::string not having mutable data() until C++17.
template <typename Char> inline Char* get_data(std::basic_string<Char>& s) {
return &s[0];
}
template <typename Container>
inline typename Container::value_type* get_data(Container& c) {
return c.data();
}
template <typename Container, FMT_ENABLE_IF(is_contiguous<Container>::value)> template <typename Container, FMT_ENABLE_IF(is_contiguous<Container>::value)>
inline typename checked<typename Container::value_type>::type reserve( inline typename checked<typename Container::value_type>::type reserve(
std::back_insert_iterator<Container>& it, std::size_t n) { std::back_insert_iterator<Container>& it, std::size_t n) {
Container& c = internal::get_container(it); Container& c = internal::get_container(it);
std::size_t size = c.size(); std::size_t size = c.size();
c.resize(size + n); c.resize(size + n);
return make_checked(&c[size], n); return make_checked(get_data(c) + size, n);
} }
template <typename Iterator> template <typename Iterator>