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Asked: 2026-05-15T19:47:01+00:00

I have the following code (which largely follows the first example here: http://www.boost.org/doc/libs/1_42_0/libs/multi_index/doc/examples.html )).

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I have the following code (which largely follows the first example here: http://www.boost.org/doc/libs/1_42_0/libs/multi_index/doc/examples.html)). For some reason, with only 10000 insertations to the multi-index, it takes several minutes to run the program. Am I doing something wrong or is this expected?

struct A  
{  
  int id;  
  int name;  
  int age;  
  A(int id_,int name_,int age_):id(id_),name(name_),age(age_){}  
};  


/* tags for accessing the corresponding indices*/  
struct id{};  
struct name{};  
struct age{};  

typedef multi_index_container<  
  A,  
  indexed_by<  
    ordered_unique<  
      tag<id>,  BOOST_MULTI_INDEX_MEMBER(A,int,id)>,  
    ordered_non_unique<  
      tag<name>,BOOST_MULTI_INDEX_MEMBER(A,int,name)>,  
    ordered_non_unique<  
      tag<age>, BOOST_MULTI_INDEX_MEMBER(A,int,age)> >  
> A_set;  



int main()  
{  
  A_set es;  

  for (int a = 0; a != 10000; a++) {  
    es.insert(A(a,a+1,a+2));  
  }  
  return 0; 
}
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1 Answer

  1. Editorial Team

    Are you by any chance compiling in debug mode? It finishes near instantly with the default release configuration in Visual Studio 2008. If you’re compiling in debug mode and you almost followed the example to the letter, including the pre-processor stuff and still had this part:

    #ifndef NDEBUG
#define BOOST_MULTI_INDEX_ENABLE_INVARIANT_CHECKING
#define BOOST_MULTI_INDEX_ENABLE_SAFE_MODE
#endif

    Then removing/disabling these defines will also significantly speed up execution time. (By at least 180x on my machine, didn’t bother letting it finish.) What the consequences of disabling or removing these things in a debug build is, I don’t know.

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