非常丑陋，但如果你只想要编译时信息(例如调试):

auto testVar = std::make_tuple(1, 1.0, "abc");
decltype(testVar)::foo= 1;

返回:

Compilation finished with errors:
source.cpp: In function 'int main()':
source.cpp:5:19: error: 'foo' is not a member of 'std::tuple<int, double, const char*>'

注意，c++的RTTI特性生成的名称是不可移植的。 例如，类

MyNamespace::CMyContainer<int, test_MyNamespace::CMyObject>

将有以下名称:

// MSVC 2003:
class MyNamespace::CMyContainer[int,class test_MyNamespace::CMyObject]
// G++ 4.2:
N8MyNamespace8CMyContainerIiN13test_MyNamespace9CMyObjectEEE

所以不能将此信息用于序列化。但是typeid(a).name()属性仍然可以用于日志/调试目的

c++在编译时使用模板和运行时使用TypeId进行数据类型解析。

编译时解决方案。

template <std::size_t...Idxs>
constexpr auto substring_as_array(std::string_view str, std::index_sequence<Idxs...>)
{
  return std::array{str[Idxs]..., '\n'};
}

template <typename T>
constexpr auto type_name_array()
{
#if defined(__clang__)
  constexpr auto prefix   = std::string_view{"[T = "};
  constexpr auto suffix   = std::string_view{"]"};
  constexpr auto function = std::string_view{__PRETTY_FUNCTION__};
#elif defined(__GNUC__)
  constexpr auto prefix   = std::string_view{"with T = "};
  constexpr auto suffix   = std::string_view{"]"};
  constexpr auto function = std::string_view{__PRETTY_FUNCTION__};
#elif defined(_MSC_VER)
  constexpr auto prefix   = std::string_view{"type_name_array<"};
  constexpr auto suffix   = std::string_view{">(void)"};
  constexpr auto function = std::string_view{__FUNCSIG__};
#else
# error Unsupported compiler
#endif

  constexpr auto start = function.find(prefix) + prefix.size();
  constexpr auto end = function.rfind(suffix);

  static_assert(start < end);

  constexpr auto name = function.substr(start, (end - start));
  return substring_as_array(name, std::make_index_sequence<name.size()>{});
}

template <typename T>
struct type_name_holder {
  static inline constexpr auto value = type_name_array<T>();
};

template <typename T>
constexpr auto type_name() -> std::string_view
{
  constexpr auto& value = type_name_holder<T>::value;
  return std::string_view{value.data(), value.size()};
}

运行时的解决方案。

template <typename T>
void PrintDataType(T type)
{
    auto name = typeid(type).name();
    string cmd_str = "echo '" + string(name) + "' | c++filt -t";
    system(cmd_str.c_str());
}

主要代码

#include <iostream>
#include <map>
#include <string>
#include <typeinfo>
#include <string_view>
#include <array>   // std::array
#include <utility> // std::index_sequence
using std::string;

int main () ｛ / /动态分辨率。 std::map<int, int> iMap; PrintDataType (iMap); //编译类型解析。 std:: cout < < type_name < std::列表< int > > () < < std:: endl; 返回0; }

代码片段

#include <iostream>
#include <typeinfo>
using namespace std;
#define show_type_name(_t) \
    system(("echo " + string(typeid(_t).name()) + " | c++filt -t").c_str())

int main() {
    auto a = {"one", "two", "three"};
    cout << "Type of a: " << typeid(a).name() << endl;
    cout << "Real type of a:\n";
    show_type_name(a);
    for (auto s : a) {
        if (string(s) == "one") {
            cout << "Type of s: " << typeid(s).name() << endl;
            cout << "Real type of s:\n";
            show_type_name(s);
        }
        cout << s << endl;
    }

    int i = 5;
    cout << "Type of i: " << typeid(i).name() << endl;
    cout << "Real type of i:\n";
    show_type_name(i);
    return 0;
}

输出:

Type of a: St16initializer_listIPKcE
Real type of a:
std::initializer_list<char const*>
Type of s: PKc
Real type of s:
char const*
one
two
three
Type of i: i
Real type of i:
int

不要忘记包含<typeinfo>

我相信您所指的是运行时类型标识。你可以通过做来达到以上目的。

#include <iostream>
#include <typeinfo>

using namespace std;

int main() {
  int i;
  cout << typeid(i).name();
  return 0;
}

复制这个答案:https://stackoverflow.com/a/56766138/11502722

我能够在c++ static_assert()中获得这一点。这里的问题是static_assert()只接受字符串字面量;Constexpr string_view将不起作用。你需要接受typename周围的额外文本，但它可以工作:

template<typename T>
constexpr void assertIfTestFailed()
{
#ifdef __clang__
    static_assert(testFn<T>(), "Test failed on this used type: " __PRETTY_FUNCTION__);
#elif defined(__GNUC__)
    static_assert(testFn<T>(), "Test failed on this used type: " __PRETTY_FUNCTION__);
#elif defined(_MSC_VER)
    static_assert(testFn<T>(), "Test failed on this used type: " __FUNCSIG__);
#else
    static_assert(testFn<T>(), "Test failed on this used type (see surrounding logged error for details).");
#endif
    }
}

MSVC输出:

error C2338: Test failed on this used type: void __cdecl assertIfTestFailed<class BadType>(void)
... continued trace of where the erroring code came from ...