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Fix formatting of abstract classes via ostream

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This commit is contained in:
Victor Zverovich 2021-09-02 08:13:47 -07:00
parent 8029bf955c
commit ee0659f8b6
2 changed files with 17 additions and 3 deletions
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7
include/fmt/format.h
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@ -579,9 +579,10 @@ inline auto code_point_index(basic_string_view<char8_type> s, size_t n)
return s.size();
}
template <typename T>
using is_fast_float = bool_constant<std::numeric_limits<T>::is_iec559 &&
sizeof(T) <= sizeof(double)>;
template <typename T, bool = std::is_floating_point<T>::value>
struct is_fast_float : bool_constant<std::numeric_limits<T>::is_iec559 &&
sizeof(T) <= sizeof(double)> {};
template <typename T> struct is_fast_float<T, false> : std::false_type {};
#ifndef FMT_USE_FULL_CACHE_DRAGONBOX
# define FMT_USE_FULL_CACHE_DRAGONBOX 0

13
test/ostream-test.cc
View File

@ -23,6 +23,7 @@ template <> struct formatter<test> : formatter<int> {
#include <sstream>
#include "fmt/compile.h"
#include "fmt/ostream.h"
#include "fmt/ranges.h"
#include "gmock/gmock.h"
@ -280,3 +281,15 @@ TEST(ostream_test, range) {
auto strs = std::vector<test_string>{test_string("foo"), test_string("bar")};
EXPECT_EQ("[foo, bar]", fmt::format("{}", strs));
}
struct abstract {
virtual ~abstract() = default;
virtual void f() = 0;
friend std::ostream& operator<<(std::ostream& os, const abstract&) {
return os;
}
};
void format_abstract_compiles(const abstract& a) {
fmt::format(FMT_COMPILE("{}"), a);
}