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Move has_formatter into the public fmt namespace. (#1407)

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* Move has_formatter into the public fmt namespace.

This will allow users to do SFINAE-friendly checks for
the formattability of a type.

Fixes #1369
This commit is contained in:
David P. Sicilia 2019-11-14 10:08:24 -05:00 committed by Victor Zverovich
parent 52ae134f84
commit 2145a7bdcc
3 changed files with 8 additions and 8 deletions
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4
include/fmt/core.h
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@ -542,14 +542,14 @@ struct FMT_DEPRECATED convert_to_int
: bool_constant<!std::is_arithmetic<T>::value &&
std::is_convertible<T, int>::value> {};
namespace internal {
// Specifies if T has an enabled formatter specialization. A type can be
// formattable even if it doesn't have a formatter e.g. via a conversion.
template <typename T, typename Context>
using has_formatter =
std::is_constructible<typename Context::template formatter_type<T>>;
namespace internal {
/** A contiguous memory buffer with an optional growing ability. */
template <typename T> class buffer {
private:

8
test/core-test.cc
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@ -453,11 +453,11 @@ template <> struct formatter<enabled_formatter> {
FMT_END_NAMESPACE
TEST(CoreTest, HasFormatter) {
using fmt::internal::has_formatter;
using fmt::has_formatter;
using context = fmt::format_context;
EXPECT_TRUE((has_formatter<enabled_formatter, context>::value));
EXPECT_FALSE((has_formatter<disabled_formatter, context>::value));
EXPECT_FALSE((has_formatter<disabled_formatter_convertible, context>::value));
static_assert(has_formatter<enabled_formatter, context>::value, "");
static_assert(!has_formatter<disabled_formatter, context>::value, "");
static_assert(!has_formatter<disabled_formatter_convertible, context>::value, "");
}
struct convertible_to_int {

4
test/format-test.cc
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@ -1974,8 +1974,8 @@ enum TestEnum { A };
TEST(FormatTest, Enum) { EXPECT_EQ("0", fmt::format("{}", A)); }
TEST(FormatTest, FormatterNotSpecialized) {
EXPECT_FALSE((fmt::internal::has_formatter<fmt::formatter<TestEnum>,
fmt::format_context>::value));
static_assert(!fmt::has_formatter<fmt::formatter<TestEnum>,
fmt::format_context>::value, "");
}
#if FMT_HAS_FEATURE(cxx_strong_enums)