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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/gtest.h>
// Check if 'if constexpr' is supported.
#if (__cplusplus > 201402L) || \
(defined(_MSVC_LANG) && _MSVC_LANG > 201402L && _MSC_VER >= 1910)
# 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> t{42, 1.5f, "this is tuple",
'i'};
EXPECT_EQ("(42, 1.5, \"this is tuple\", 'i')", fmt::format("{}", t));
EXPECT_EQ("()", fmt::format("{}", std::tuple<>()));
}
TEST(RangesTest, JoinTuple) {
// Value tuple args
std::tuple<char, int, float> t1 = std::make_tuple('a', 1, 2.0f);
EXPECT_EQ("(a, 1, 2)", 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", fmt::format("{}", fmt::join(t4, "/")));
}
TEST(RangesTest, JoinInitializerList) {
EXPECT_EQ("1, 2, 3", fmt::format("{}", fmt::join({1, 2, 3}, ", ")));
EXPECT_EQ("fmt rocks !",
fmt::format("{}", fmt::join({"fmt", "rocks", "!"}, " ")));
}
struct my_struct {
int32_t i;
std::string str; // can throw
template <size_t N> decltype(auto) get() const noexcept {
if constexpr (N == 0)
return i;
else if constexpr (N == 1)
return fmt::string_view{str};
}
};
template <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<size_t, 2> {};
template <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
struct zstring_sentinel {};
bool operator==(const char* p, zstring_sentinel) { return *p == '\0'; }
bool operator!=(const char* p, zstring_sentinel) { return *p != '\0'; }
struct zstring {
const char* p;
const char* begin() const { return p; }
zstring_sentinel end() const { return {}; }
};
TEST(RangesTest, JoinSentinel) {
zstring hello{"hello"};
EXPECT_EQ("{'h', 'e', 'l', 'l', 'o'}", fmt::format("{}", hello));
EXPECT_EQ("h_e_l_l_o", fmt::format("{}", fmt::join(hello, "_")));
}
// A range that provides non-const only begin()/end() to test fmt::join handles
// that
//
// Some ranges (eg those produced by range-v3's views::filter()) can cache
// information during iteration so they only provide non-const begin()/end().
template <typename T> class non_const_only_range {
private:
std::vector<T> vec;
public:
using const_iterator = typename ::std::vector<T>::const_iterator;
template <typename... Args>
explicit non_const_only_range(Args&&... args)
: vec(::std::forward<Args>(args)...) {}
const_iterator begin() { return vec.begin(); }
const_iterator end() { return vec.end(); }
};
TEST(RangesTest, JoinRange) {
non_const_only_range<int> x(3u, 0);
EXPECT_EQ("0,0,0", fmt::format("{}", fmt::join(x, ",")));
EXPECT_EQ(
"0,0,0",
fmt::format("{}", fmt::join(non_const_only_range<int>(3u, 0), ",")));
std::vector<int> y(3u, 0);
EXPECT_EQ("0,0,0", fmt::format("{}", fmt::join(y, ",")));
EXPECT_EQ("0,0,0",
fmt::format("{}", fmt::join(std::vector<int>(3u, 0), ",")));
const std::vector<int> z(3u, 0);
EXPECT_EQ("0,0,0", fmt::format("{}", fmt::join(z, ",")));
}
#if !FMT_MSC_VER || FMT_MSC_VER >= 1927
struct unformattable {};
TEST(RangesTest, UnformattableRange) {
EXPECT_FALSE((fmt::has_formatter<std::vector<unformattable>,
fmt::format_context>::value));
}
#endif
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