std::binary_function is missing in MSVC 14.37.32822

Question

The std::binary_function was not supposed to be removed until C++17, but it appears to have been removed in MSVC 14.37.32822. This seems to be due to the xstddef file was removed in this version, but the file exists in earlier versions like 14.36 and 14.34.

This is ultimately causing our code to fail to build with the following error:

Error C2039 'binary_function': is not a member of 'std'

Note that our project is being compiled with the "Default (ISO C++14 Standard)" so we haven't yet updated to C++17.

Is it expected for the std::binary_function to be removed in 14.37.32822 or is this a bug in MSVC?

For reference, here are exact locations of where the xstddef file is supposed to be:

C:\Program Files\Microsoft Visual Studio\2022\Professional\VC\Tools\MSVC\14.34.31933\include -> File exists (code builds fine)

C:\Program Files\Microsoft Visual Studio\2022\Enterprise\VC\Tools\MSVC\14.37.32822\include -> File does not exist (code fails to build)

Answer 1

Hi,@tashman

std::binary_function is in header file functional.
You could test the sample below.
I am using Version: VS2022 Preview. C++ 14. MSVC: 14.38.32919.

#include <algorithm>
#include <functional>
#include <iostream>
#include <vector>

struct same : std::binary_function<int, int, bool>
{
    bool operator()(int a, int b) const { return a == b; }
};

int main()
{
    std::vector<char> v1{ 'A', 'B', 'C', 'D', 'E' };
    std::vector<char> v2{ 'E', 'D', 'C', 'B', 'A' };
    std::vector<bool> v3(v1.size());

    std::transform(v1.begin(), v1.end(), v2.begin(), v3.begin(), std::not2(same()));

    std::cout << std::boolalpha;
    for (std::size_t i = 0; i < v1.size(); ++i)
        std::cout << v1[i] << " != " << v2[i] << " : " << v3[i] << '\n';
}

Best regards,

Minxin Yu

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