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#include <iostream>
#include <type_traits>
 
struct A {
    int m;
};
 
struct B {
    B(const B&) {}
};
 
struct C {
    virtual void foo();
};
 
int main()
{
    std::cout << std::boolalpha;
    std::cout << std::is_trivially_copyable<A>::value << '\n';
    std::cout << std::is_trivially_copyable<B>::value << '\n';
    std::cout << std::is_trivially_copyable<C>::value << '\n';
}

prog.cpp: In function 'int main()':
prog.cpp:19:18: error: 'is_trivially_copyable' is not a member of 'std'
     std::cout << std::is_trivially_copyable<A>::value << '\n';
                  ^
prog.cpp:19:46: error: expected primary-expression before '>' token
     std::cout << std::is_trivially_copyable<A>::value << '\n';
                                              ^
prog.cpp:19:47: error: '::value' has not been declared
     std::cout << std::is_trivially_copyable<A>::value << '\n';
                                               ^
prog.cpp:20:18: error: 'is_trivially_copyable' is not a member of 'std'
     std::cout << std::is_trivially_copyable<B>::value << '\n';
                  ^
prog.cpp:20:46: error: expected primary-expression before '>' token
     std::cout << std::is_trivially_copyable<B>::value << '\n';
                                              ^
prog.cpp:20:47: error: '::value' has not been declared
     std::cout << std::is_trivially_copyable<B>::value << '\n';
                                               ^
prog.cpp:21:18: error: 'is_trivially_copyable' is not a member of 'std'
     std::cout << std::is_trivially_copyable<C>::value << '\n';
                  ^
prog.cpp:21:46: error: expected primary-expression before '>' token
     std::cout << std::is_trivially_copyable<C>::value << '\n';
                                              ^
prog.cpp:21:47: error: '::value' has not been declared
     std::cout << std::is_trivially_copyable<C>::value << '\n';
                                               ^

Standard output is empty