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add non-char support for compile-time format check

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XZiar 2018-10-26 15:55:03 -07:00 committed by Victor Zverovich
parent ccd3e8bbf3
commit b98e8301d5
3 changed files with 15 additions and 7 deletions
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8
include/fmt/core.h
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@ -472,9 +472,11 @@ struct compile_string {};
template <typename S>
struct is_compile_string : std::is_base_of<compile_string, S> {};
template <typename S>
inline typename std::enable_if<is_compile_string<S>::value, string_view>::type
to_string_view(const S &s) { return {s.data(), s.size() - 1}; }
template <typename S, typename Enable = std::enable_if<is_compile_string<S>::value>>
inline auto to_string_view(const S &s) -> basic_string_view<typename S::Char> {
typedef typename S::Char Char;
return basic_string_view<Char>{s.data(), s.size() - 1};
}
template <typename Context>
class basic_format_arg;

10
include/fmt/format.h
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@ -2243,9 +2243,10 @@ FMT_CONSTEXPR bool check_format_string(
template <typename... Args, typename String>
typename std::enable_if<is_compile_string<String>::value>::type
check_format_string(String format_str) {
typedef typename String::Char Char;
FMT_CONSTEXPR_DECL bool invalid_format =
internal::check_format_string<char, internal::error_handler, Args...>(
string_view(format_str.data(), format_str.size()));
internal::check_format_string<Char, internal::error_handler, Args...>(
basic_string_view<Char>(format_str.data(), format_str.size()));
(void)invalid_format;
}
@ -3597,9 +3598,10 @@ FMT_END_NAMESPACE
#define FMT_STRING(s) [] { \
typedef typename std::decay<decltype(s)>::type pointer; \
struct S : fmt::compile_string { \
typedef typename std::remove_cv<std::remove_pointer<pointer>::type>::type Char;\
static FMT_CONSTEXPR pointer data() { return s; } \
static FMT_CONSTEXPR size_t size() { return sizeof(s); } \
explicit operator fmt::string_view() const { return s; } \
static FMT_CONSTEXPR size_t size() { return sizeof(s) / sizeof(Char); } \
explicit operator fmt::basic_string_view<Char>() const { return s; } \
}; \
return S{}; \
}()

4
test/format-test.cc
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@ -1859,6 +1859,7 @@ TEST(FormatTest, UdlTemplate) {
EXPECT_EQ("foo", "foo"_format());
EXPECT_EQ(" 42", "{0:10}"_format(42));
EXPECT_EQ("42", fmt::format(FMT_STRING("{}"), 42));
EXPECT_EQ(L"42", fmt::format(FMT_STRING(L"{}"), 42));
}
#endif // FMT_USE_USER_DEFINED_LITERALS
@ -2378,6 +2379,9 @@ TEST(FormatTest, VFormatTo) {
std::wstring w;
fmt::vformat_to(std::back_inserter(w), L"{}", wargs);
EXPECT_EQ(L"42", w);
w.clear();
fmt::vformat_to(std::back_inserter(w), FMT_STRING(L"{}"), args);
EXPECT_EQ("42", w);
}
#endif // FMT_USE_CONSTEXPR