c++ - view the default functions generated by a compiler? -

Is there a way to see the default functions generated by a compiler (for example, the default copy constructor, default assignment operator) VC ++ 2008 for the class which does not define them?

With the compiler, you can see them by passing -st-dump

  [js @ HOST2 cpp] $ cat main1.cpp struct A { }; [Js @ HOST2 cpp] $ clag ++ - cc 1 -st-dump man 1 cpp typingfaces four * __ baltin__w_list; Structure A {Public: Structure A; Inline A (); Inline A (structure is a const & amp;;); Inline structure A and operator = (structure a const & amp;;); Inline Zero ~ A (); }; [Js @ HOST2 CPP] $  

I hope that whatever you have asked. Let's change the code and look again.

[js @ HOST2 cpp] $ cat main1.cpp structure M {M (M & M); }; Structure A {Mm; }; [Js @ HOST2 cpp] $ clag ++ - cc 1 -st-dump man 1 cpp typingfaces four * __ baltin_value_list; Structure M {Public: Straight M; M (Structure M & amp;); Inline structure M and operator = (Structure M const & amp;;); Inline zero ~ m (); }; Structure A {Public: Structure A; Structure MM; Inline A (); Inline A (Structure A and;); Inline structure A and operator = (structure a const & amp;;); Inline Zero ~ A (); }; [Js @ HOST2 cpp] $

Note how the contract code constructor of A is now a non-constant reference parameter because one of its members (Member m ), and that M has not been declared as a default constructor

To obtain the generated code, you can use the virtual machine Intermediate can get out of the language. Check the generated code for:

  struct A {virtual zeros f (); Int a; }; AF () {AA; A = A (); Return; } // def-ctor, assignment and copy-CTO [js @ HOST2 cpp] using $ clang ++ -cc1 -O1 -emit-llvm -o - main1.cpp | C ++ filt [snippet] Define linkonce_odr void @ a :: a () (% struct.A * nocapture% this) nounwind align 2 {enter:% 0 = getelementptr inbounds% struct.A *% this, i32 0 , I32 0; & Lt; I8 *** & gt; [Uses = 1] Store i8 ** GatementElector Inbound ([3 x i8 *] * @vtable for A, i32 0, i32 2), i8 ***% 0 ret zero} linkonce_odr% struct.A * Define @A: operator = (a const & amp;) (% struct.A *% this,% struct.A * nocapture) alignname nounwind 2 {enter:% tmp = getelementptr inbounds% struct.A * % This, i32 0, i32 1; & Lt; I32 * & gt; [# Usage = 1]% tmp2 = getelementptr inbounds% struct.A *% 0, i32 0, i32 1; & Lt; I32 * & gt; [# Usage = 1]% tmp3 = Load i32 *% tmp2; & Lt; I32 & gt; [Uses = 1] Store i32% tmp3, i32 *% tmp ret% struct.A *% this} Defined linkonce_odr Zero @ A :: A (a const & amp; (% struct.A * nocapture% This,% struct. A * encryption) Align novevnence 2 {Enter:% tmp = gateetext inbound% strait. A *% A, iOS 0, iOS 1; & Lt; I32 * & gt; [# Usage = 1]% tmp2 = getelementptr inbounds% struct.A *% 0, i32 0, i32 1; & Lt; I32 * & gt; [# Usage = 1]% tmp3 = Load i32 *% tmp2; & Lt; I32 & gt; [Uses = 1] Store i32% tmp3, i32 *% tmp% 1 = getelementptr inbounds% struct.A *% this, i32 0, i32 0; & Lt; I8 *** & gt; [# Uses = 1] Store i8 ** GatementElector Inbound ([3 x i8 *] * @vtable for A, i32 0, i322), i8 ***% 1Art zero}  < / Pre> 
 Now, I do not understand the intermediate language (which has been defined). But you can translate that code into C. using the llvm compiler: 
 
  [js @ HOST2 cpp] $ clang ++ -cc1 -O1 -emit-llvm -o - main1. Cpp | Llc -march = c -o - | C ++ filt [snippet] void A :: A () (struct l_struct.A * llvm_cbe_this) {* ((& amp; llvm_cbe_this-> Field 0)) = ((& amp; _ZTV1A.array [(Signed Ent 2u)])); Return; } Struct l_struct.A * A :: operator = (a const & amp;) (struct l_struct.A * llvm_cbe_this, struct l_struct.A * llvm_cbe_tmp__1) {unsigned int llvm_cbe_tmp3; Llvm_cbe_tmp3 = * ((& amp; llvm_cbe_tmp__1- & gt; Field 1)); * ((& Amp; llvm_cbe_this-> Field 1)) = llvm_cbe_tmp3; Return llvm_cbe_this; } Zero A: A (a const & amp; l (structure l_struct.A * llvm_cbe_this, struct l_struct.A * llvm_cbe_tmp__2) {unsigned int llvm_cbe_tmp3; Llvm_cbe_tmp3 = * ((& amp; llvm_cbe_tmp__2-> Field 1)); * ((& Amp; llvm_cbe_this-> Field 1)) = llvm_cbe_tmp3; * ((& Amp; llvm_cbe_this-> Field 0)) = ((& amp; _ZTV1A.array [((signed Ent) 2u)]))); Return; }  
 
 Tada! Notice how this sets the virtual table pointer in the copy constructor and the default constructor. Hope this will help.