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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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include/fmt/core.h
+14 -16
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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,
typename Context::template formatter_type<T>,
internal::fallback_formatter<T, char_type>>::type>;
T, conditional_t<is_formattable<T, Context>::value,
typename Context::template formatter_type<T>,
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)