۰.۱۳ — کامپایلر من از چه استاندارد زبانی استفاده می‌کند؟

            
 1    // This program prints the C++ language standard your compiler is currently using
 2    // Freely redistributable, courtesy of learncpp.com (https://www.learncpp.com/cpp-tutorial/what-language-standard-is-my-compiler-using/)
 3
 4    #include <iostream>
 5
 6    const int numStandards = 7;
 7    // The C++26 stdCode is a placeholder since the exact code won't be determined until the standard is finalized
 8    const long stdCode[numStandards] = { 199711L, 201103L, 201402L, 201703L, 202002L, 202302L, 202612L};
 9    const char* stdName[numStandards] = { "Pre-C++11", "C++11", "C++14", "C++17", "C++20", "C++23", "C++26" };
10
11    long getCPPStandard()
12    {
13        // Visual Studio is non-conforming in support for __cplusplus (unless you set a specific compiler flag, which you probably haven't)
14        // In Visual Studio 2015 or newer we can use _MSVC_LANG instead
15        // See https://devblogs.microsoft.com/cppblog/msvc-now-correctly-reports-__cplusplus/
16    #if defined (_MSVC_LANG)
17        return _MSVC_LANG;
18    #elif defined (_MSC_VER)
19        // If we're using an older version of Visual Studio, bail out
20        return -1;
21    #else
22        // __cplusplus is the intended way to query the language standard code (as defined by the language standards)
23        return __cplusplus;
24    #endif
25    }
26
27    int main()
28    {
29        long standard = getCPPStandard();
30
31        if (standard == -1)
32        {
33            std::cout << "Error: Unable to determine your language standard.  Sorry.\n";
34            return 0;
35        }
36
37        for (int i = 0; i < numStandards; ++i)
38        {
39            // If the reported version is one of the finalized standard codes
40            // then we know exactly what version the compiler is running
41            if (standard == stdCode[i])
42            {
43                std::cout << "Your compiler is using " << stdName[i]
44                    << " (language standard code " << standard << "L)\n";
45                break;
46            }
47
48            // If the reported version is between two finalized standard codes,
49            // this must be a preview / experimental support for the next upcoming version.
50            if (standard < stdCode[i])
51            {
52                std::cout << "Your compiler is using a preview/pre-release of " << stdName[i]
53                    << " (language standard code " << standard << "L)\n";
54                break;
55            }
56        }
57
58        return 0;
59    }