fmt/test/ranges-test.cc
2024-09-13 18:41:10 -07:00

796 lines
24 KiB
C++

// Formatting library for C++ - ranges tests
//
// Copyright (c) 2012 - present, Victor Zverovich and {fmt} contributors
// All rights reserved.
//
// For the license information refer to format.h.
#include "fmt/ranges.h"
#include <array>
#include <list>
#include <map>
#include <numeric>
#include <queue>
#include <stack>
#include <string>
#include <utility>
#include <vector>
#if FMT_CPLUSPLUS > 201703L && FMT_HAS_INCLUDE(<ranges>)
# include <ranges>
#endif
#include "fmt/format.h"
#include "gtest/gtest.h"
#if !FMT_GCC_VERSION || FMT_GCC_VERSION >= 601
# define FMT_RANGES_TEST_ENABLE_C_STYLE_ARRAY
#endif
#if !FMT_MSC_VERSION || FMT_MSC_VERSION > 1910
# define FMT_RANGES_TEST_ENABLE_JOIN
# define FMT_RANGES_TEST_ENABLE_FORMAT_STRUCT
#endif
#ifdef FMT_RANGES_TEST_ENABLE_C_STYLE_ARRAY
TEST(ranges_test, format_array) {
int arr[] = {1, 2, 3, 5, 7, 11};
EXPECT_EQ(fmt::format("{}", arr), "[1, 2, 3, 5, 7, 11]");
}
TEST(ranges_test, format_2d_array) {
int arr[][2] = {{1, 2}, {3, 5}, {7, 11}};
EXPECT_EQ(fmt::format("{}", arr), "[[1, 2], [3, 5], [7, 11]]");
}
TEST(ranges_test, format_array_of_literals) {
const char* arr[] = {"1234", "abcd"};
EXPECT_EQ(fmt::format("{}", arr), "[\"1234\", \"abcd\"]");
EXPECT_EQ(fmt::format("{:n}", arr), "\"1234\", \"abcd\"");
EXPECT_EQ(fmt::format("{:n:}", arr), "1234, abcd");
}
#endif // FMT_RANGES_TEST_ENABLE_C_STYLE_ARRAY
TEST(ranges_test, format_vector) {
auto v = std::vector<int>{1, 2, 3, 5, 7, 11};
EXPECT_EQ(fmt::format("{}", v), "[1, 2, 3, 5, 7, 11]");
EXPECT_EQ(fmt::format("{::#x}", v), "[0x1, 0x2, 0x3, 0x5, 0x7, 0xb]");
EXPECT_EQ(fmt::format("{:n:#x}", v), "0x1, 0x2, 0x3, 0x5, 0x7, 0xb");
auto vc = std::vector<char>{'a', 'b', 'c'};
auto vec = std::vector<char>{'a', '\n', '\t'};
auto vvc = std::vector<std::vector<char>>{vc, vc};
EXPECT_EQ(fmt::format("{}", vc), "['a', 'b', 'c']");
EXPECT_EQ(fmt::format("{:s}", vc), "\"abc\"");
EXPECT_EQ(fmt::format("{:?s}", vec), "\"a\\n\\t\"");
EXPECT_EQ(fmt::format("{:s}", vec), "\"a\n\t\"");
EXPECT_EQ(fmt::format("{::s}", vvc), "[\"abc\", \"abc\"]");
EXPECT_EQ(fmt::format("{}", vvc), "[['a', 'b', 'c'], ['a', 'b', 'c']]");
EXPECT_EQ(fmt::format("{:n}", vvc), "['a', 'b', 'c'], ['a', 'b', 'c']");
EXPECT_EQ(fmt::format("{:n:n}", vvc), "'a', 'b', 'c', 'a', 'b', 'c'");
EXPECT_EQ(fmt::format("{:n:n:}", vvc), "a, b, c, a, b, c");
}
TEST(ranges_test, format_nested_vector) {
auto v = std::vector<std::vector<int>>{{1, 2}, {3, 5}, {7, 11}};
EXPECT_EQ(fmt::format("{}", v), "[[1, 2], [3, 5], [7, 11]]");
EXPECT_EQ(fmt::format("{:::#x}", v), "[[0x1, 0x2], [0x3, 0x5], [0x7, 0xb]]");
EXPECT_EQ(fmt::format("{:n:n:#x}", v), "0x1, 0x2, 0x3, 0x5, 0x7, 0xb");
}
TEST(ranges_test, to_string_vector) {
auto v = std::vector<std::string>{"a", "b", "c"};
EXPECT_EQ(fmt::to_string(v), "[\"a\", \"b\", \"c\"]");
}
TEST(ranges_test, format_map) {
auto m = std::map<std::string, int>{{"one", 1}, {"two", 2}};
EXPECT_EQ(fmt::format("{}", m), "{\"one\": 1, \"two\": 2}");
EXPECT_EQ(fmt::format("{:n}", m), "\"one\": 1, \"two\": 2");
}
struct test_map_value {};
FMT_BEGIN_NAMESPACE
template <> struct formatter<test_map_value> : formatter<string_view> {
auto format(test_map_value, format_context& ctx) const
-> format_context::iterator {
return formatter<string_view>::format("foo", ctx);
}
};
template <typename K>
struct formatter<std::pair<K, test_map_value>> : formatter<string_view> {
auto format(std::pair<K, test_map_value>, format_context& ctx) const
-> format_context::iterator {
return ctx.out();
}
};
template <typename K>
struct is_tuple_formattable<std::pair<K, test_map_value>, char>
: std::false_type {};
FMT_END_NAMESPACE
TEST(ranges_test, format_map_custom_pair) {
EXPECT_EQ(fmt::format("{}", std::map<int, test_map_value>{{42, {}}}),
"{42: \"foo\"}");
}
TEST(ranges_test, format_set) {
EXPECT_EQ(fmt::format("{}", std::set<std::string>{"one", "two"}),
"{\"one\", \"two\"}");
}
// Models std::flat_set close enough to test if no ambiguous lookup of a
// formatter happens due to the flat_set type matching is_set and
// is_container_adaptor_like.
template <typename T> class flat_set {
public:
using key_type = T;
using container_type = std::vector<T>;
using iterator = typename std::vector<T>::iterator;
using const_iterator = typename std::vector<T>::const_iterator;
template <typename... Ts>
explicit flat_set(Ts&&... args) : c{std::forward<Ts>(args)...} {}
auto begin() -> iterator { return c.begin(); }
auto end() -> iterator { return c.end(); }
auto begin() const -> const_iterator { return c.begin(); }
auto end() const -> const_iterator { return c.end(); }
private:
std::vector<T> c;
};
TEST(ranges_test, format_flat_set) {
EXPECT_EQ(fmt::format("{}", flat_set<std::string>{"one", "two"}),
"{\"one\", \"two\"}");
}
namespace adl {
struct box {
int value;
};
auto begin(const box& b) -> const int* { return &b.value; }
auto end(const box& b) -> const int* { return &b.value + 1; }
} // namespace adl
TEST(ranges_test, format_adl_begin_end) {
auto b = adl::box{42};
EXPECT_EQ(fmt::format("{}", b), "[42]");
}
TEST(ranges_test, format_pair) {
auto p = std::pair<int, float>(42, 1.5f);
EXPECT_EQ(fmt::format("{}", p), "(42, 1.5)");
EXPECT_EQ(fmt::format("{:}", p), "(42, 1.5)");
EXPECT_EQ(fmt::format("{:n}", p), "421.5");
}
struct unformattable {};
TEST(ranges_test, format_tuple) {
auto t =
std::tuple<int, float, std::string, char>(42, 1.5f, "this is tuple", 'i');
EXPECT_EQ(fmt::format("{}", t), "(42, 1.5, \"this is tuple\", 'i')");
EXPECT_EQ(fmt::format("{:n}", t), "421.5\"this is tuple\"'i'");
EXPECT_EQ(fmt::format("{}", std::tuple<>()), "()");
EXPECT_TRUE((fmt::is_formattable<std::tuple<>>::value));
EXPECT_FALSE((fmt::is_formattable<unformattable>::value));
EXPECT_FALSE((fmt::is_formattable<std::tuple<unformattable>>::value));
EXPECT_FALSE((fmt::is_formattable<std::tuple<unformattable, int>>::value));
EXPECT_FALSE((fmt::is_formattable<std::tuple<int, unformattable>>::value));
EXPECT_FALSE(
(fmt::is_formattable<std::tuple<unformattable, unformattable>>::value));
EXPECT_TRUE((fmt::is_formattable<std::tuple<int, float>>::value));
}
struct not_default_formattable {};
struct bad_format {};
FMT_BEGIN_NAMESPACE
template <> struct formatter<not_default_formattable> {
auto parse(format_parse_context&) -> const char* { throw bad_format(); }
auto format(not_default_formattable, format_context& ctx)
-> format_context::iterator {
return ctx.out();
}
};
FMT_END_NAMESPACE
TEST(ranges_test, tuple_parse_calls_element_parse) {
auto f = fmt::formatter<std::tuple<not_default_formattable>>();
auto ctx = fmt::format_parse_context("");
EXPECT_THROW(f.parse(ctx), bad_format);
}
#ifdef FMT_RANGES_TEST_ENABLE_FORMAT_STRUCT
struct tuple_like {
int i;
std::string str;
template <size_t N>
auto get() const noexcept -> fmt::enable_if_t<N == 0, int> {
return i;
}
template <size_t N>
auto get() const noexcept -> fmt::enable_if_t<N == 1, fmt::string_view> {
return str;
}
};
template <size_t N>
auto get(const tuple_like& t) noexcept -> decltype(t.get<N>()) {
return t.get<N>();
}
namespace std {
template <>
struct tuple_size<tuple_like> : std::integral_constant<size_t, 2> {};
template <size_t N> struct tuple_element<N, tuple_like> {
using type = decltype(std::declval<tuple_like>().get<N>());
};
} // namespace std
TEST(ranges_test, format_struct) {
auto t = tuple_like{42, "foo"};
EXPECT_EQ(fmt::format("{}", t), "(42, \"foo\")");
}
#endif // FMT_RANGES_TEST_ENABLE_FORMAT_STRUCT
TEST(ranges_test, format_to) {
char buf[10];
auto end = fmt::format_to(buf, "{}", std::vector<int>{1, 2, 3});
*end = '\0';
EXPECT_STREQ(buf, "[1, 2, 3]");
}
template <typename Char> struct path_like {
auto begin() const -> const path_like*;
auto end() const -> const path_like*;
operator std::basic_string<Char>() const;
};
TEST(ranges_test, disabled_range_formatting_of_path) {
// Range formatting of path is disabled because of infinite recursion
// (path element is itself a path).
EXPECT_EQ((fmt::range_format_kind<path_like<char>, char>::value),
fmt::range_format::disabled);
EXPECT_EQ((fmt::range_format_kind<path_like<wchar_t>, char>::value),
fmt::range_format::disabled);
}
struct vector_string : std::vector<char> {
using base = std::vector<char>;
using base::base;
};
struct vector_debug_string : std::vector<char> {
using base = std::vector<char>;
using base::base;
};
FMT_BEGIN_NAMESPACE
template <>
struct range_format_kind<vector_string, char>
: std::integral_constant<range_format, range_format::string> {};
template <>
struct range_format_kind<vector_debug_string, char>
: std::integral_constant<range_format, range_format::debug_string> {};
FMT_END_NAMESPACE
TEST(ranges_test, range_format_string) {
const vector_string v{'f', 'o', 'o'};
EXPECT_EQ(fmt::format("{}", v), "foo");
}
TEST(ranges_test, range_format_debug_string) {
const vector_debug_string v{'f', 'o', 'o'};
EXPECT_EQ(fmt::format("{}", v), "\"foo\"");
}
// A range that provides non-const only begin()/end() to test fmt::join
// handles that.
//
// Some ranges (e.g. 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)...) {}
auto begin() -> const_iterator { return vec.begin(); }
auto end() -> const_iterator { return vec.end(); }
};
template <typename T> class noncopyable_range {
private:
std::vector<T> vec;
public:
using iterator = typename ::std::vector<T>::iterator;
template <typename... Args>
explicit noncopyable_range(Args&&... args)
: vec(std::forward<Args>(args)...) {}
noncopyable_range(noncopyable_range const&) = delete;
noncopyable_range(noncopyable_range&) = delete;
auto begin() -> iterator { return vec.begin(); }
auto end() -> iterator { return vec.end(); }
};
TEST(ranges_test, range) {
auto&& w = noncopyable_range<int>(3u, 0);
EXPECT_EQ(fmt::format("{}", w), "[0, 0, 0]");
EXPECT_EQ(fmt::format("{}", noncopyable_range<int>(3u, 0)), "[0, 0, 0]");
auto x = non_const_only_range<int>(3u, 0);
EXPECT_EQ(fmt::format("{}", x), "[0, 0, 0]");
EXPECT_EQ(fmt::format("{}", non_const_only_range<int>(3u, 0)), "[0, 0, 0]");
auto y = std::vector<int>(3u, 0);
EXPECT_EQ(fmt::format("{}", y), "[0, 0, 0]");
EXPECT_EQ(fmt::format("{}", std::vector<int>(3u, 0)), "[0, 0, 0]");
const auto z = std::vector<int>(3u, 0);
EXPECT_EQ(fmt::format("{}", z), "[0, 0, 0]");
}
enum test_enum { foo, bar };
auto format_as(test_enum e) -> int { return e; }
TEST(ranges_test, enum_range) {
auto v = std::vector<test_enum>{test_enum::foo};
EXPECT_EQ(fmt::format("{}", v), "[0]");
}
#if !FMT_MSC_VERSION
TEST(ranges_test, unformattable_range) {
EXPECT_FALSE((fmt::is_formattable<std::vector<unformattable>, char>::value));
}
#endif
TEST(ranges_test, join) {
using fmt::join;
int v1[3] = {1, 2, 3};
auto v2 = std::vector<float>();
v2.push_back(1.2f);
v2.push_back(3.4f);
void* v3[2] = {&v1[0], &v1[1]};
EXPECT_EQ(fmt::format("({})", join(v1, v1 + 3, ", ")), "(1, 2, 3)");
EXPECT_EQ(fmt::format("({})", join(v1, v1 + 1, ", ")), "(1)");
EXPECT_EQ(fmt::format("({})", join(v1, v1, ", ")), "()");
EXPECT_EQ(fmt::format("({:03})", join(v1, v1 + 3, ", ")), "(001, 002, 003)");
EXPECT_EQ("(+01.20, +03.40)",
fmt::format("({:+06.2f})", join(v2.begin(), v2.end(), ", ")));
EXPECT_EQ(fmt::format("{0:{1}}", join(v1, v1 + 3, ", "), 1), "1, 2, 3");
EXPECT_EQ(fmt::format("{}, {}", v3[0], v3[1]),
fmt::format("{}", join(v3, v3 + 2, ", ")));
EXPECT_EQ(fmt::format("({})", join(v1, ", ")), "(1, 2, 3)");
EXPECT_EQ(fmt::format("({:+06.2f})", join(v2, ", ")), "(+01.20, +03.40)");
auto v4 = std::vector<test_enum>{foo, bar, foo};
EXPECT_EQ(fmt::format("{}", join(v4, " ")), "0 1 0");
}
#ifdef __cpp_lib_byte
TEST(ranges_test, join_bytes) {
auto v = std::vector<std::byte>{std::byte(1), std::byte(2), std::byte(3)};
EXPECT_EQ(fmt::format("{}", fmt::join(v, ", ")), "1, 2, 3");
}
#endif
#ifdef FMT_RANGES_TEST_ENABLE_JOIN
TEST(ranges_test, join_tuple) {
// Value tuple args.
auto t1 = std::tuple<char, int, float>('a', 1, 2.0f);
EXPECT_EQ(fmt::format("({})", fmt::join(t1, ", ")), "(a, 1, 2)");
// Testing lvalue tuple args.
int x = 4;
auto t2 = std::tuple<char, int&>('b', x);
EXPECT_EQ(fmt::format("{}", fmt::join(t2, " + ")), "b + 4");
// Empty tuple.
auto t3 = std::tuple<>();
EXPECT_EQ(fmt::format("{}", fmt::join(t3, "|")), "");
// Single element tuple.
auto t4 = std::tuple<float>(4.0f);
EXPECT_EQ(fmt::format("{}", fmt::join(t4, "/")), "4");
# if FMT_TUPLE_JOIN_SPECIFIERS
// Specs applied to each element.
auto t5 = std::tuple<int, int, long>(-3, 100, 1);
EXPECT_EQ(fmt::format("{:+03}", fmt::join(t5, ", ")), "-03, +100, +01");
auto t6 = std::tuple<float, double, long double>(3, 3.14, 3.1415);
EXPECT_EQ(fmt::format("{:5.5f}", fmt::join(t6, ", ")),
"3.00000, 3.14000, 3.14150");
// Testing lvalue tuple args.
int y = -1;
auto t7 = std::tuple<int, int&, const int&>(3, y, y);
EXPECT_EQ(fmt::format("{:03}", fmt::join(t7, ", ")), "003, -01, -01");
# endif
}
TEST(ranges_test, join_initializer_list) {
EXPECT_EQ(fmt::format("{}", fmt::join({1, 2, 3}, ", ")), "1, 2, 3");
EXPECT_EQ(fmt::format("{}", fmt::join({"fmt", "rocks", "!"}, " ")),
"fmt rocks !");
}
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;
auto begin() const -> const char* { return p; }
auto end() const -> zstring_sentinel { return {}; }
};
# ifdef __cpp_lib_ranges
struct cpp20_only_range {
struct iterator {
int val = 0;
using value_type = int;
using difference_type = std::ptrdiff_t;
using iterator_concept = std::input_iterator_tag;
iterator() = default;
iterator(int i) : val(i) {}
auto operator*() const -> int { return val; }
auto operator++() -> iterator& {
++val;
return *this;
}
void operator++(int) { ++*this; }
auto operator==(const iterator& rhs) const -> bool {
return val == rhs.val;
}
};
int lo;
int hi;
auto begin() const -> iterator { return iterator(lo); }
auto end() const -> iterator { return iterator(hi); }
};
static_assert(std::input_iterator<cpp20_only_range::iterator>);
# endif
TEST(ranges_test, join_sentinel) {
auto hello = zstring{"hello"};
EXPECT_EQ(fmt::format("{}", hello), "['h', 'e', 'l', 'l', 'o']");
EXPECT_EQ(fmt::format("{::}", hello), "[h, e, l, l, o]");
EXPECT_EQ(fmt::format("{}", fmt::join(hello, "_")), "h_e_l_l_o");
}
TEST(ranges_test, join_range) {
auto&& w = noncopyable_range<int>(3u, 0);
EXPECT_EQ(fmt::format("{}", fmt::join(w, ",")), "0,0,0");
EXPECT_EQ(fmt::format("{}", fmt::join(noncopyable_range<int>(3u, 0), ",")),
"0,0,0");
auto x = non_const_only_range<int>(3u, 0);
EXPECT_EQ(fmt::format("{}", fmt::join(x, ",")), "0,0,0");
EXPECT_EQ(fmt::format("{}", fmt::join(non_const_only_range<int>(3u, 0), ",")),
"0,0,0");
auto y = std::vector<int>(3u, 0);
EXPECT_EQ(fmt::format("{}", fmt::join(y, ",")), "0,0,0");
EXPECT_EQ(fmt::format("{}", fmt::join(std::vector<int>(3u, 0), ",")),
"0,0,0");
const auto z = std::vector<int>(3u, 0);
EXPECT_EQ(fmt::format("{}", fmt::join(z, ",")), "0,0,0");
# ifdef __cpp_lib_ranges
EXPECT_EQ(fmt::format("{}", cpp20_only_range{.lo = 0, .hi = 5}),
"[0, 1, 2, 3, 4]");
EXPECT_EQ(
fmt::format("{}", fmt::join(cpp20_only_range{.lo = 0, .hi = 5}, ",")),
"0,1,2,3,4");
# endif
}
namespace adl {
struct vec {
int n[2] = {42, 43};
};
auto begin(const vec& v) -> const int* { return v.n; }
auto end(const vec& v) -> const int* { return v.n + 2; }
} // namespace adl
TEST(ranges_test, format_join_adl_begin_end) {
EXPECT_EQ(fmt::format("{}", fmt::join(adl::vec(), "/")), "42/43");
}
#endif // FMT_RANGES_TEST_ENABLE_JOIN
#if defined(__cpp_lib_ranges) && __cpp_lib_ranges >= 202207L
TEST(ranges_test, nested_ranges) {
auto l = std::list{1, 2, 3};
auto r = std::views::iota(0, 3) | std::views::transform([&l](auto i) {
return std::views::take(std::ranges::subrange(l), i);
}) |
std::views::transform(std::views::reverse);
EXPECT_EQ(fmt::format("{}", r), "[[], [1], [2, 1]]");
}
#endif
TEST(ranges_test, is_printable) {
using fmt::detail::is_printable;
EXPECT_TRUE(is_printable(0x0323));
EXPECT_FALSE(is_printable(0x0378));
EXPECT_FALSE(is_printable(0x110000));
}
TEST(ranges_test, escape) {
using vec = std::vector<std::string>;
EXPECT_EQ(fmt::format("{}", vec{"\n\r\t\"\\"}), "[\"\\n\\r\\t\\\"\\\\\"]");
EXPECT_EQ(fmt::format("{}", vec{"\x07"}), "[\"\\x07\"]");
EXPECT_EQ(fmt::format("{}", vec{"\x7f"}), "[\"\\x7f\"]");
EXPECT_EQ(fmt::format("{}", vec{"n\xcc\x83"}), "[\"n\xcc\x83\"]");
if (fmt::detail::use_utf8) {
EXPECT_EQ(fmt::format("{}", vec{"\xcd\xb8"}), "[\"\\u0378\"]");
// Unassigned Unicode code points.
EXPECT_EQ(fmt::format("{}", vec{"\xf0\xaa\x9b\x9e"}), "[\"\\U0002a6de\"]");
// Broken utf-8.
EXPECT_EQ(fmt::format("{}", vec{"\xf4\x8f\xbf\xc0"}),
"[\"\\xf4\\x8f\\xbf\\xc0\"]");
EXPECT_EQ(fmt::format("{}", vec{"\xf0\x28"}), "[\"\\xf0(\"]");
EXPECT_EQ(fmt::format("{}", vec{"\xe1\x28"}), "[\"\\xe1(\"]");
EXPECT_EQ(fmt::format("{}", vec{std::string("\xf0\x28\0\0anything", 12)}),
"[\"\\xf0(\\x00\\x00anything\"]");
// Correct utf-8.
EXPECT_EQ(fmt::format("{}", vec{"🦄"}), "[\"🦄\"]");
}
EXPECT_EQ(fmt::format("{}", std::vector<std::vector<char>>{{'x'}}),
"[['x']]");
// Disabled due to a clang 17 bug: https://github.com/fmtlib/fmt/issues/4144.
#if FMT_CLANG_VERSION >= 1800
EXPECT_EQ(fmt::format("{}", std::tuple<std::vector<char>>{{'x'}}), "(['x'])");
#endif
}
template <typename R> struct fmt_ref_view {
R* r;
auto begin() const -> decltype(r->begin()) { return r->begin(); }
auto end() const -> decltype(r->end()) { return r->end(); }
};
TEST(ranges_test, range_of_range_of_mixed_const) {
auto v = std::vector<std::vector<int>>{{1, 2, 3}, {4, 5}};
EXPECT_EQ(fmt::format("{}", v), "[[1, 2, 3], [4, 5]]");
auto r = fmt_ref_view<decltype(v)>{&v};
EXPECT_EQ(fmt::format("{}", r), "[[1, 2, 3], [4, 5]]");
}
TEST(ranges_test, vector_char) {
EXPECT_EQ(fmt::format("{}", std::vector<char>{'a', 'b'}), "['a', 'b']");
}
TEST(ranges_test, container_adaptor) {
{
using fmt::detail::is_container_adaptor_like;
using T = std::nullptr_t;
static_assert(is_container_adaptor_like<std::stack<T>>::value, "");
static_assert(is_container_adaptor_like<std::queue<T>>::value, "");
static_assert(is_container_adaptor_like<std::priority_queue<T>>::value, "");
static_assert(!is_container_adaptor_like<std::vector<T>>::value, "");
}
{
auto s = std::stack<int>();
s.push(1);
s.push(2);
EXPECT_EQ(fmt::format("{}", s), "[1, 2]");
EXPECT_EQ(fmt::format("{}", const_cast<const decltype(s)&>(s)), "[1, 2]");
}
{
auto q = std::queue<int>();
q.push(1);
q.push(2);
EXPECT_EQ(fmt::format("{}", q), "[1, 2]");
}
{
auto q = std::priority_queue<int>();
q.push(3);
q.push(1);
q.push(2);
q.push(4);
EXPECT_EQ(fmt::format("{}", q), "[4, 3, 2, 1]");
}
{
auto s = std::stack<char, std::string>();
s.push('a');
s.push('b');
// See https://cplusplus.github.io/LWG/issue3881.
EXPECT_EQ(fmt::format("{}", s), "['a', 'b']");
}
{
struct my_container_adaptor {
using value_type = int;
using container_type = std::vector<value_type>;
void push(const value_type& v) { c.push_back(v); }
protected:
container_type c;
};
auto m = my_container_adaptor();
m.push(1);
m.push(2);
EXPECT_EQ(fmt::format("{}", m), "[1, 2]");
}
}
struct tieable {
int a = 3;
double b = 0.42;
};
auto format_as(const tieable& t) -> std::tuple<int, double> {
return std::tie(t.a, t.b);
}
TEST(ranges_test, format_as_tie) {
EXPECT_EQ(fmt::format("{}", tieable()), "(3, 0.42)");
}
struct lvalue_qualified_begin_end {
int arr[5] = {1, 2, 3, 4, 5};
auto begin() & -> const int* { return arr; }
auto end() & -> const int* { return arr + 5; }
};
TEST(ranges_test, lvalue_qualified_begin_end) {
EXPECT_EQ(fmt::format("{}", lvalue_qualified_begin_end{}), "[1, 2, 3, 4, 5]");
}
#if !defined(__cpp_lib_ranges) || __cpp_lib_ranges <= 202106L
# define ENABLE_STD_VIEWS_TESTS 0
#elif FMT_CLANG_VERSION
# if FMT_CLANG_VERSION > 1500
# define ENABLE_STD_VIEWS_TESTS 1
# else
# define ENABLE_STD_VIEWS_TESTS 0
# endif
#else
# define ENABLE_STD_VIEWS_TESTS 1
#endif
#if ENABLE_STD_VIEWS_TESTS
TEST(ranges_test, input_range_join) {
auto iss = std::istringstream("1 2 3 4 5");
auto view = std::views::istream<std::string>(iss);
EXPECT_EQ("1, 2, 3, 4, 5",
fmt::format("{}", fmt::join(view.begin(), view.end(), ", ")));
}
TEST(ranges_test, input_range_join_overload) {
auto iss = std::istringstream("1 2 3 4 5");
EXPECT_EQ(
"1.2.3.4.5",
fmt::format("{}", fmt::join(std::views::istream<std::string>(iss), ".")));
}
namespace views_filter_view_test {
struct codec_mask {
static constexpr auto codecs = std::array{0, 1, 2, 3};
int except = 0;
};
auto format_as(codec_mask mask) {
// Careful not to capture param by reference here, it will dangle.
return codec_mask::codecs |
std::views::filter([mask](auto c) { return c != mask.except; });
}
} // namespace views_filter_view_test
TEST(ranges_test, format_as_with_ranges_mutable_begin_end) {
using namespace views_filter_view_test;
{
auto make_filter_view = []() {
return codec_mask::codecs |
std::views::filter([](auto c) { return c != 2; });
};
auto r = make_filter_view();
EXPECT_EQ("[0, 1, 3]", fmt::format("{}", r));
EXPECT_EQ("[0, 1, 3]", fmt::format("{}", make_filter_view()));
}
{
auto mask = codec_mask{2};
const auto const_mask = codec_mask{2};
EXPECT_EQ("[0, 1, 3]", fmt::format("{}", mask));
EXPECT_EQ("[0, 1, 3]", fmt::format("{}", const_mask));
EXPECT_EQ("[0, 1, 3]", fmt::format("{}", codec_mask{2}));
}
}
#endif
TEST(ranges_test, std_istream_iterator_join) {
auto&& iss = std::istringstream("1 2 3 4 5");
auto first = std::istream_iterator<int>(iss);
auto last = std::istream_iterator<int>();
EXPECT_EQ("1, 2, 3, 4, 5", fmt::format("{}", fmt::join(first, last, ", ")));
}
// Mirrors C++20 std::ranges::basic_istream_view::iterator.
struct noncopyable_istream_iterator : std::istream_iterator<int> {
using base = std::istream_iterator<int>;
explicit noncopyable_istream_iterator(std::istringstream& iss) : base{iss} {}
noncopyable_istream_iterator(const noncopyable_istream_iterator&) = delete;
noncopyable_istream_iterator(noncopyable_istream_iterator&&) = default;
};
static_assert(!std::is_copy_constructible<noncopyable_istream_iterator>::value,
"");
TEST(ranges_test, movable_only_istream_iter_join) {
auto&& iss = std::istringstream("1 2 3 4 5");
auto first = noncopyable_istream_iterator(iss);
auto last = std::istream_iterator<int>();
EXPECT_EQ("1, 2, 3, 4, 5",
fmt::format("{}", fmt::join(std::move(first), last, ", ")));
}
struct movable_iter_range {
std::istringstream iss{"1 2 3 4 5"};
noncopyable_istream_iterator begin() {
return noncopyable_istream_iterator{iss};
}
std::istream_iterator<int> end() { return {}; }
};
TEST(ranges_test, movable_only_istream_iter_join2) {
EXPECT_EQ("[1, 2, 3, 4, 5]", fmt::format("{}", movable_iter_range{}));
}
struct not_range {
void begin() const {}
void end() const {}
};
static_assert(!fmt::is_formattable<not_range>{}, "");