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Workaround for missing lconv support in android (#327)

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This commit is contained in:
Dmitry Panteleev 2016-05-16 20:07:14 -04:00
parent 5b106083e7
commit 45a1509455
1 changed files with 17 additions and 1 deletions
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18
fmt/format.h
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@ -910,6 +910,21 @@ class ThousandsSep {
}
};
// Returns the thousands separator for the current locale.
// On android the lconv structure is stubbed using an empty structure
// The test is for the size only, not for the presense of
// thousands_sep in std::lconv, because if one would add thousands_sep
// at some point, the size of structure would be at least sizeof(char*)
template<typename Lconv, bool=(sizeof(Lconv) >= sizeof(char*))>
struct Locale {
static fmt::StringRef thousands_sep() { return ""; }
};
template<typename Lconv>
struct Locale<Lconv, true> {
static fmt::StringRef thousands_sep() { return static_cast<Lconv*>(std::localeconv())->thousands_sep; }
};
// Formats a decimal unsigned integer value writing into buffer.
// thousands_sep is a functor that is called after writing each char to
// add a thousands separator if necessary.
@ -2778,7 +2793,8 @@ void BasicWriter<Char>::write_int(T value, Spec spec) {
}
case 'n': {
unsigned num_digits = internal::count_digits(abs_value);
fmt::StringRef sep = std::localeconv()->thousands_sep;
fmt::StringRef sep =
internal::Locale<lconv>::thousands_sep();
unsigned size = static_cast<unsigned>(
num_digits + sep.size() * (num_digits - 1) / 3);
CharPtr p = prepare_int_buffer(size, spec, prefix, prefix_size) + 1;