fmt/test/ranges-test.cc

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// Formatting library for C++ - the core API
//
// Copyright (c) 2012 - present, Victor Zverovich
// All rights reserved.
//
// For the license information refer to format.h.
//
// Copyright (c) 2018 - present, Remotion (Igor Schulz)
// All Rights Reserved
// {fmt} support for ranges, containers and types tuple interface.
#include "fmt/ranges.h"
#include "gtest.h"
// Check if 'if constexpr' is supported.
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#if (__cplusplus > 201402L) || \
(defined(_MSVC_LANG) && _MSVC_LANG > 201402L && _MSC_VER >= 1910)
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# include <array>
# include <map>
# include <string>
# include <vector>
TEST(RangesTest, FormatVector) {
std::vector<int32_t> iv{1, 2, 3, 5, 7, 11};
auto ivf = fmt::format("{}", iv);
EXPECT_EQ("{1, 2, 3, 5, 7, 11}", ivf);
}
TEST(RangesTest, FormatVector2) {
std::vector<std::vector<int32_t>> ivv{{1, 2}, {3, 5}, {7, 11}};
auto ivf = fmt::format("{}", ivv);
EXPECT_EQ("{{1, 2}, {3, 5}, {7, 11}}", ivf);
}
TEST(RangesTest, FormatMap) {
std::map<std::string, int32_t> simap{{"one", 1}, {"two", 2}};
EXPECT_EQ("{(\"one\", 1), (\"two\", 2)}", fmt::format("{}", simap));
}
TEST(RangesTest, FormatPair) {
std::pair<int64_t, float> pa1{42, 1.5f};
EXPECT_EQ("(42, 1.5)", fmt::format("{}", pa1));
}
TEST(RangesTest, FormatTuple) {
std::tuple<int64_t, float, std::string, char> tu1{42, 1.5f, "this is tuple",
'i'};
EXPECT_EQ("(42, 1.5, \"this is tuple\", 'i')", fmt::format("{}", tu1));
}
TEST(RangesTest, JoinTuple) {
// Value tuple args
std::tuple<char, int, float> t1 = std::make_tuple('a', 1, 2.0f);
EXPECT_EQ("(a, 1, 2.0)", fmt::format("({})", fmt::join(t1, ", ")));
// Testing lvalue tuple args
int x = 4;
std::tuple<char, int&> t2{'b', x};
EXPECT_EQ("b + 4", fmt::format("{}", fmt::join(t2, " + ")));
// Empty tuple
std::tuple<> t3;
EXPECT_EQ("", fmt::format("{}", fmt::join(t3, "|")));
// Single element tuple
std::tuple<float> t4{4.0f};
EXPECT_EQ("4.0", fmt::format("{}", fmt::join(t4, "/")));
}
struct my_struct {
int32_t i;
std::string str; // can throw
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template <std::size_t N> decltype(auto) get() const noexcept {
if constexpr (N == 0)
return i;
else if constexpr (N == 1)
return fmt::string_view{str};
}
};
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template <std::size_t N> decltype(auto) get(const my_struct& s) noexcept {
return s.get<N>();
}
namespace std {
template <>
struct tuple_size<my_struct> : std::integral_constant<std::size_t, 2> {};
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template <std::size_t N> struct tuple_element<N, my_struct> {
using type = decltype(std::declval<my_struct>().get<N>());
};
} // namespace std
TEST(RangesTest, FormatStruct) {
my_struct mst{13, "my struct"};
EXPECT_EQ("(13, \"my struct\")", fmt::format("{}", mst));
}
TEST(RangesTest, FormatTo) {
char buf[10];
auto end = fmt::format_to(buf, "{}", std::vector{1, 2, 3});
*end = '\0';
EXPECT_STREQ(buf, "{1, 2, 3}");
}
struct path_like {
const path_like* begin() const;
const path_like* end() const;
operator std::string() const;
};
TEST(RangesTest, PathLike) {
EXPECT_FALSE((fmt::is_range<path_like, char>::value));
}
#endif // (__cplusplus > 201402L) || (defined(_MSVC_LANG) && _MSVC_LANG >
// 201402L && _MSC_VER >= 1910)
#ifdef FMT_USE_STRING_VIEW
struct string_like {
const char* begin();
const char* end();
explicit operator fmt::string_view() const { return "foo"; }
explicit operator std::string_view() const { return "foo"; }
};
TEST(RangesTest, FormatStringLike) {
EXPECT_EQ("foo", fmt::format("{}", string_like()));
}
#endif // FMT_USE_STRING_VIEW