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  1. #include <bits/stdc++.h>
  2. #include <typeinfo>
  3. using namespace std;
  4. void show(string r,string t){printf("ref='%s'; tmp='%s';\n",r.c_str(),t.c_str());}
  5. template<class TYPE>
  6. void foo(TYPE&ref,bool a,bool b){
  7.   TYPE tmp=ref; // <---- тут беда, если foo звать как foo<T&>(...);
  8.   if(a)tmp="a";
  9.   if(b)ref="b";
  10.   show(ref,tmp);cout<<__PRETTY_FUNCTION__;
  11. }
  12. int main(){
  13.   #define F(CODE){string s="s";printf("%s // ",#CODE);CODE;}
  14.   F(  foo<string&>(s,1,0);  );
  15.   F(  foo<string >(s,1,0);  );
  16.   F(  foo<string&>(s,0,1);  );
  17.   F(  foo<string >(s,0,1);  );
  18.   F(  foo<string&>(s,1,1);  );
  19.   F(  foo<string >(s,1,1);  );
  20.   #undef F
  21. }
Success #stdin #stdout 0s 15240KB
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foo<string&>(s,1,0); // ref='a'; tmp='a';
void foo(TYPE &, bool, bool) [TYPE = std::__cxx11::basic_string<char> &]foo<string >(s,1,0); // ref='s'; tmp='a';
void foo(TYPE &, bool, bool) [TYPE = std::__cxx11::basic_string<char>]foo<string&>(s,0,1); // ref='b'; tmp='b';
void foo(TYPE &, bool, bool) [TYPE = std::__cxx11::basic_string<char> &]foo<string >(s,0,1); // ref='b'; tmp='s';
void foo(TYPE &, bool, bool) [TYPE = std::__cxx11::basic_string<char>]foo<string&>(s,1,1); // ref='b'; tmp='b';
void foo(TYPE &, bool, bool) [TYPE = std::__cxx11::basic_string<char> &]foo<string >(s,1,1); // ref='b'; tmp='a';
void foo(TYPE &, bool, bool) [TYPE = std::__cxx11::basic_string<char>]
https://ideone.com/VDPZnt
language:
C++14 (clang 8.0)
created:
4 years ago
visibility:
public

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