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This commit is contained in:
Victor Zverovich 2024-02-10 07:38:29 -08:00
parent 7a63e233d2
commit 91b30e5b4e
2 changed files with 25 additions and 6 deletions
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12
test/scan-test.cc
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@ -110,15 +110,25 @@ TEST(scan_test, invalid_format) {
"invalid format string");
}
namespace std {
using fmt::scan;
using fmt::scan_error;
}
TEST(scan_test, example) {
// Example from https://wg21.link/p1729r3.
if (auto result = fmt::scan<std::string, int>("answer = 42", "{} = {}")) {
if (auto result = std::scan<std::string, int>("answer = 42", "{} = {}")) {
auto range = result->range();
EXPECT_EQ(range.begin(), range.end());
EXPECT_EQ(result->begin(), result->end());
#ifdef __cpp_structured_bindings
const auto& [key, value] = result->values();
EXPECT_EQ(key, "answer");
EXPECT_EQ(value, 42);
#endif
} else {
std::scan_error error = result.error();
(void)error;
FAIL();
}
}

19
test/scan.h
View File

@ -570,9 +570,10 @@ void make_args(std::array<scan_arg, sizeof...(T)>& args,
}
} // namespace detail
template <typename... T> class scan_data {
template <typename Range, typename... T> class scan_data {
private:
std::tuple<T...> values_;
Range range_;
public:
scan_data() = default;
@ -589,6 +590,11 @@ template <typename... T> class scan_data {
detail::make_args<0>(args, values_);
return args;
}
auto range() const -> Range { return range_; }
auto begin() const -> decltype(range_.begin()) { return range_.begin(); }
auto end() const -> decltype(range_.end()) { return range_.end(); }
};
template <typename... T>
@ -610,10 +616,12 @@ template <typename T, typename E> class expected {
explicit operator bool() const { return has_value_; }
auto operator->() const -> const T* { return &value_; }
auto error() -> E const { return E(); }
};
template <typename... T>
using scan_result = expected<scan_data<T...>, scan_error>;
template <typename Range, typename... T>
using scan_result = expected<scan_data<Range, T...>, scan_error>;
auto vscan(string_view input, string_view fmt, scan_args args)
-> string_view::iterator {
@ -630,8 +638,9 @@ auto scan_to(string_view input, string_view fmt, T&... args)
}
template <typename... T>
auto scan(string_view input, string_view fmt) -> scan_result<T...> {
auto data = scan_data<T...>();
auto scan(string_view input, string_view fmt)
-> scan_result<string_view, T...> {
auto data = scan_data<string_view, T...>();
vscan(input, fmt, data.make_args());
return data;
}