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const std::map?

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故里飘歌
故里飘歌 2021-01-12 07:45 
// BOOST Includes
#include              // Boost::Assign
#include      // Boost::Assign::List_Of
#include <
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  • 庸人自扰
    庸人自扰 (楼主)
    2021-01-12 08:27

    I tried this, and it fails because the keys of the map need to be comparable (with std::less, thus there needs to be an operator< defined). boost::tuple's comparison operators are defined in the header boost/tuple/tuple_comparison.hpp.

    Having included that, this code works fine:

    #include 
#include 
#include 
#include 
#include 

using std::string;
typedef boost::tuple tpl_t;

int main() {
    using boost::assign::map_list_of;
    std::map const m = 
        map_list_of(tpl_t("a","b","c"), "c")(tpl_t("x","y","c"), "z");
}

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