fork download

copy

#include <iostream>                                                                          
#include <functional>                                                                        
 
struct A                                                                                     
{                                                                                            
    std::function<void ()> b = [&](){ std::cout << this->i << std::endl; };                  
    int i = 0;                                                                               
};                                                                                           
 
int main()                                                                                   
{                                                                                            
    A a;                                                                                     
    a.i = 2;                                                                                 
    a.b();                                                                                   
}
 

prog.cpp: In lambda function:
prog.cpp:6:44: error: 'std::cout' cannot appear in a constant-expression
prog.cpp:6:52: error: 'this' cannot appear in a constant-expression
prog.cpp:6:58: error: '->' cannot appear in a constant-expression
prog.cpp:6:68: error: 'std::endl(std::basic_ostream<_CharT, _Traits>&)' cannot appear in a constant-expression
prog.cpp: At global scope:
prog.cpp:6:74: error: ISO C++ forbids initialization of member 'b'
prog.cpp:6:74: error: making 'b' static
prog.cpp:6:74: error: invalid in-class initialization of static data member of non-integral type 'std::function<void()>'
prog.cpp:7:13: error: ISO C++ forbids initialization of member 'i'
prog.cpp:7:13: error: making 'i' static
prog.cpp:7:13: error: ISO C++ forbids in-class initialization of non-const static member 'i'
prog.cpp: In function 'int main()':
prog.cpp:14:7: error: 'struct A' has no member named 'b'

Standard output is empty