External/fmt
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Improve error reporting

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This commit is contained in:
Aamr El Kazdadi 2019-12-08 03:46:55 +01:00
parent 95dfdc6cc4
commit f6ac897b72
1 changed files with 48 additions and 3 deletions
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51
include/fmt/core.h
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@ -809,7 +809,9 @@ template <typename Context> class value {
private:
// Formats an argument of a custom type, such as a user-defined class.
template <typename T, typename Formatter>
template <typename T, typename Formatter,
FMT_ENABLE_IF(has_formatter<T, Context>::value ||
has_fallback_formatter<T, Context>::value)>
static void format_custom_arg(
const void* arg, basic_format_parse_context<char_type>& parse_ctx,
Context& ctx) {
@ -817,6 +819,16 @@ template <typename Context> class value {
parse_ctx.advance_to(f.parse(parse_ctx));
ctx.advance_to(f.format(*static_cast<const T*>(arg), ctx));
}
template <typename T, typename Formatter,
FMT_ENABLE_IF(!has_formatter<T, Context>::value &&
!has_fallback_formatter<T, Context>::value)>
static void format_custom_arg(
const void* arg, basic_format_parse_context<char_type>& parse_ctx,
Context& ctx) {
(void)arg;
(void)parse_ctx;
(void)ctx;
}
};
template <typename Context, typename T>
@ -828,6 +840,14 @@ enum { long_short = sizeof(long) == sizeof(int) };
using long_type = conditional_t<long_short, int, long long>;
using ulong_type = conditional_t<long_short, unsigned, unsigned long long>;
template <typename From, typename... To> struct is_convertible_to_any {};
template <typename From>
struct is_convertible_to_any<From> : std::false_type {};
template <typename From, typename FirstTo, typename... To>
struct is_convertible_to_any<From, FirstTo, To...>
: conditional_t<std::is_convertible<From, FirstTo>::value, std::true_type,
is_convertible_to_any<From, To...>> {};
// Maps formatting arguments to core types.
template <typename Context> struct arg_mapper {
using char_type = typename Context::char_type;
@ -878,8 +898,7 @@ template <typename Context> struct arg_mapper {
FMT_ENABLE_IF(
std::is_constructible<std_string_view<char_type>, T>::value &&
!std::is_constructible<basic_string_view<char_type>, T>::value &&
!is_string<T>::value &&
!has_formatter<T, Context>::value &&
!is_string<T>::value && !has_formatter<T, Context>::value &&
!has_fallback_formatter<T, Context>::value)>
FMT_CONSTEXPR basic_string_view<char_type> map(const T& val) {
return std_string_view<char_type>(val);
@ -923,6 +942,32 @@ template <typename Context> struct arg_mapper {
return val;
}
template <
typename T,
FMT_ENABLE_IF(
!is_convertible_to_any<
const T&, signed char, unsigned char, short, unsigned short, int,
unsigned, long, unsigned long, long long, unsigned long long,
int128_t, uint128_t, bool, float, double, long double, char_type*,
const char_type*, const char*, const signed char*,
const unsigned char*, void*, const void*,
std::nullptr_t>::value &&
!std::is_constructible<basic_string_view<char_type>, T>::value &&
!std::is_constructible<std_string_view<char_type>, T>::value &&
!is_string<T>::value && !is_char<T>::value &&
!std::is_enum<T>::value && !has_formatter<T, Context>::value &&
!has_fallback_formatter<T, Context>::value)>
FMT_CONSTEXPR const T& map(const T& val) {
static_assert(
has_formatter<T, Context>::value ||
has_fallback_formatter<T, Context>::value,
"Cannot format argument. To enable the use of ostream operator<< "
"include fmt/ostream.h. Otherwise specialize the formatter<T> struct "
"template and implement parse and format methods.");
return val;
}
template <typename T>
FMT_CONSTEXPR const named_arg_base<char_type>& map(
const named_arg<T, char_type>& val) {