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Add conditional_t for pre-C++14

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This commit is contained in:
Victor Zverovich 2019-06-04 18:50:30 -07:00
parent 4aa0dc578b
commit c264e641ea
6 changed files with 36 additions and 40 deletions
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6
include/fmt/chrono.h
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@ -450,9 +450,9 @@ struct chrono_formatter {
OutputIt out;
int precision;
// rep is unsigned to avoid overflow.
using rep = typename std::conditional<
std::is_integral<Rep>::value && sizeof(Rep) < sizeof(int), unsigned,
typename make_unsigned_or_unchanged<Rep>::type>::type;
using rep =
conditional_t<std::is_integral<Rep>::value && sizeof(Rep) < sizeof(int),
unsigned, typename make_unsigned_or_unchanged<Rep>::type>;
rep val;
typedef std::chrono::duration<rep> seconds;
seconds s;

28
include/fmt/core.h
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@ -200,9 +200,11 @@
FMT_BEGIN_NAMESPACE
// An implementation of enable_if_t for pre-C++14 systems.
// Implementations of enable_if_t and other types for pre-C++14 systems.
template <bool B, class T = void>
using enable_if_t = typename std::enable_if<B, T>::type;
template <bool B, class T, class F>
using conditional_t = typename std::conditional<B, T, F>::type;
// An enable_if helper to be used in template parameters which results in much
// shorter symbols: https://godbolt.org/z/sWw4vP. Extra parentheses are needed
@ -646,10 +648,9 @@ template <typename Char> struct string_value {
};
template <typename Context> struct custom_value {
using parse_context = basic_parse_context<typename Context::char_type>;
const void* value;
void (*format)(const void* arg,
basic_parse_context<typename Context::char_type>& parse_ctx,
Context& ctx);
void (*format)(const void* arg, parse_context& parse_ctx, Context& ctx);
};
template <typename T, typename Context>
@ -704,10 +705,9 @@ template <typename Context> class value {
// have different extension points, e.g. `formatter<T>` for `format` and
// `printf_formatter<T>` for `printf`.
custom.format = &format_custom_arg<
T, typename std::conditional<
is_formattable<T, Context>::value,
T, conditional_t<is_formattable<T, Context>::value,
typename Context::template formatter_type<T>,
internal::fallback_formatter<T, char_type>>::type>;
internal::fallback_formatter<T, char_type>>>;
}
const named_arg_base<char_type>& as_named_arg() {
@ -758,12 +758,11 @@ FMT_MAKE_VALUE_SAME(uint_type, unsigned)
// To minimize the number of types we need to deal with, long is translated
// either to int or to long long depending on its size.
using long_type =
std::conditional<sizeof(long) == sizeof(int), int, long long>::type;
using long_type = conditional_t<sizeof(long) == sizeof(int), int, long long>;
FMT_MAKE_VALUE((sizeof(long) == sizeof(int) ? int_type : long_long_type), long,
long_type)
using ulong_type = std::conditional<sizeof(unsigned long) == sizeof(unsigned),
unsigned, unsigned long long>::type;
using ulong_type = conditional_t<sizeof(unsigned long) == sizeof(unsigned),
unsigned, unsigned long long>;
FMT_MAKE_VALUE((sizeof(unsigned long) == sizeof(unsigned) ? uint_type
: ulong_long_type),
unsigned long, ulong_type)
@ -1129,9 +1128,8 @@ template <typename Context, typename... Args> class format_arg_store {
// Packed is a macro on MinGW so use IS_PACKED instead.
static const bool IS_PACKED = NUM_ARGS < internal::max_packed_args;
using value_type =
typename std::conditional<IS_PACKED, internal::value<Context>,
basic_format_arg<Context>>::type;
using value_type = conditional_t<IS_PACKED, internal::value<Context>,
basic_format_arg<Context>>;
// If the arguments are not packed, add one more element to mark the end.
static const size_t DATA_SIZE =
@ -1274,7 +1272,7 @@ template <typename Context> class basic_format_args {
};
/** An alias to ``basic_format_args<context>``. */
// It is a separate type rather than a typedef to make symbols readable.
// It is a separate type rather than an alias to make symbols readable.
struct format_args : basic_format_args<format_context> {
template <typename... Args>
format_args(Args&&... arg)

9
include/fmt/format.h
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@ -698,8 +698,8 @@ FMT_CONSTEXPR bool is_negative(T) {
template <typename T> struct int_traits {
// Smallest of uint32_t and uint64_t that is large enough to represent
// all values of T.
typedef typename std::conditional<std::numeric_limits<T>::digits <= 32,
uint32_t, uint64_t>::type main_type;
using main_type =
conditional_t<std::numeric_limits<T>::digits <= 32, uint32_t, uint64_t>;
};
// Static data is placed in this class template to allow header-only
@ -2181,9 +2181,10 @@ FMT_CONSTEXPR const typename ParseContext::char_type* parse_format_specs(
ParseContext& ctx) {
// GCC 7.2 requires initializer.
typedef typename ParseContext::char_type char_type;
typename std::conditional<is_formattable<T, format_context>::value,
conditional_t<is_formattable<T, format_context>::value,
formatter<T, char_type>,
internal::fallback_formatter<T, char_type>>::type f;
internal::fallback_formatter<T, char_type>>
f;
return f.parse(ctx);
}

10
include/fmt/prepare.h
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@ -440,9 +440,8 @@ template <typename Format> class compiletime_prepared_parts_type_provider {
typedef format_part<char_type> value_type;
};
typedef typename std::conditional<static_cast<bool>(number_of_format_parts),
format_parts_array<number_of_format_parts>,
empty>::type type;
using type = conditional_t<static_cast<bool>(number_of_format_parts),
format_parts_array<number_of_format_parts>, empty>;
};
template <typename Parts> class compiletime_prepared_parts_collector {
@ -674,9 +673,8 @@ struct compiletime_format_tag {};
struct runtime_format_tag {};
template <typename Format> struct format_tag {
typedef typename std::conditional<is_compile_string<Format>::value,
compiletime_format_tag,
runtime_format_tag>::type type;
using type = conditional_t<is_compile_string<Format>::value,
compiletime_format_tag, runtime_format_tag>;
};
#if FMT_USE_CONSTEXPR

9
include/fmt/printf.h
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@ -91,15 +91,14 @@ class arg_converter : public function<void> {
template <typename U, FMT_ENABLE_IF(std::is_integral<U>::value)>
void operator()(U value) {
bool is_signed = type_ == 'd' || type_ == 'i';
typedef typename std::conditional<std::is_same<T, void>::value, U, T>::type
TargetType;
if (const_check(sizeof(TargetType) <= sizeof(int))) {
using target_type = conditional_t<std::is_same<T, void>::value, U, T>;
if (const_check(sizeof(target_type) <= sizeof(int))) {
// Extra casts are used to silence warnings.
if (is_signed) {
arg_ = internal::make_arg<Context>(
static_cast<int>(static_cast<TargetType>(value)));
static_cast<int>(static_cast<target_type>(value)));
} else {
typedef typename make_unsigned_or_bool<TargetType>::type Unsigned;
typedef typename make_unsigned_or_bool<target_type>::type Unsigned;
arg_ = internal::make_arg<Context>(
static_cast<unsigned>(static_cast<Unsigned>(value)));
}

6
include/fmt/ranges.h
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@ -94,11 +94,11 @@ template <typename T, typename _ = void> struct is_range_ : std::false_type {};
#if !FMT_MSC_VER || FMT_MSC_VER > 1800
template <typename T>
struct is_range_<T, typename std::conditional<
false,
struct is_range_<
T, conditional_t<false,
conditional_helper<decltype(std::declval<T>().begin()),
decltype(std::declval<T>().end())>,
void>::type> : std::true_type {};
void>> : std::true_type {};
#endif
/// tuple_size and tuple_element check.