c++ Standard error shown in signed*unsigned multiplication table, C++ (vc++)

Language: Layout:

//Microsoft (R) C/C++ Optimizing Compiler Version 19.00.23506 for x64

#include <iostream>
#include <type_traits>

template<typename T1, typename T2>
void div(const T1& D = -5, const T2& Q = 5, const T1& E = -25)
{
    const T1 R = Q * D;
    if (R == E)
        std::cout << " +  ";
    else
        std::cout << std::hex << R << " "; //" - ";
}

void div_table(const int8_t d, const int8_t q, const int8_t r)
{
    std::cout << std::dec;
    std::cout << "\n Multiplication table of signed(" << int(d) << ")*unsigned(" << int(q) << ") = " << r << "\n";
    std::cout << "\n      u8 u16 u32 u64";
    std::cout << "\n i8  "; div<int8_t, uint8_t>(d, q, r); div<int16_t, uint8_t>(d, q, r); div<int32_t, uint8_t>(d, q, r); div<int64_t, uint8_t>(d, q, r);
    std::cout << "\n i16 "; div<int8_t, uint16_t>(d, q, r); div<int16_t, uint16_t>(d, q, r); div<int32_t, uint16_t>(d, q, r); div<int64_t, uint16_t>(d, q, r);
    std::cout << "\n i32 "; div<int8_t, uint32_t>(d, q, r); div<int16_t, uint32_t>(d, q, r); div<int32_t, uint32_t>(d, q, r); div<int64_t, uint32_t>(d, q, r);
    std::cout << "\n i64 "; div<int8_t, uint64_t>(d, q, r); div<int16_t, uint64_t>(d, q, r); div<int32_t, uint64_t>(d, q, r); div<int64_t, uint64_t>(d, q, r);
    std::cout << "\n";
    std::cout << std::dec;
}

int main()
{
    div_table(2, 2, 4);
    div_table(-2, 2, -4);
    div_table(-3, 3, -9);
    div_table(-5, 5, -25);
}

Show compiler warnings [ + ] Compiler args [ + ] Show input
Compilation time: 1,76 sec, absolute running time: 0,21 sec, absolute service time: 1,99 sec