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  • What is the purpose of std::make_pair vs the constructor of std::pair?
    (This answer is only correct for C++14 and earlier standards, due to CTAD) The difference is that with std::pair you need to specify the types of both elements, whereas std::make_pair will create a pair with the type of the elements that are passed to it, without you needing to tell it
  • c++ - When is it good to use std::pair? - Stack Overflow
    One place where the standard uses std::pair is for accessing elements of std::map first is the key, and second the value Would not it be much better to have a specific key_value_pair template, and refer to its fields as key and value instead of first and second? It seems to me that it would make code considerably more readable at no cost
  • c++ - How do I initialize a const std::pair? - Stack Overflow
    Let's say that I've got a : #include <utility> using namespace std; typedef pair<int, int> my_pair; how do I initialize a const my_pair ?
  • Is there a one-liner to unpack tuple pair into references?
    @StevenVascellaro The two lines I wrote (after fixing the typo of using parentheses instead of brackets) are an example of how a structured binding declaration would be used to get the values or references out of an std::tuple<int, int, int>
  • c++ - assigning members of a pair to variables - Stack Overflow
    #include <tuple> using namespace std; pair< bool, int > foo() { return make_pair( false, 3 ); } int main() { int x; bool y; auto z = foo(); x = z second; y = z first; return 0; } In the above code, the object auto z is needed to "hold" the pair before dissecting it, but its creation might be expensive in the actual code
  • c++ - What is std::pair? - Stack Overflow
    std::pair is a data type for grouping two values together as a single object std::map uses it for key, value pairs While you're learning pair, you might check out tuple It's like pair but for grouping an arbitrary number of values tuple is part of TR1 and many compilers already include it with their Standard Library implementations
  • Difference between std::pair and std::tuple with only two members?
    That said, std::pair can only have two values - not zero, one, three or more TWO values A tuple, however, has almost no semantic limitation on the number of values An std::pair, therefore, is a more accurate, type safe type to use if you actually want to specify a pair of values
  • How to best access elements of std::pair? - Stack Overflow
    While using std::pair I came across two different approaches to access its elements As they both seem to be valid and working I was wondering what is the difference between them and which approach is the preferred one?
  • Does C++ provide a triple template, comparable to pair lt;T1, T2 gt;?
    Class template std::tuple is a fixed-size collection of heterogeneous values, available in standard library since C++11
  • stl - Using pair in C++ - Stack Overflow
    The usage of pair in C++ pair<some_datatype, some_other_datatype> my_pairs; The above line will make pairs of the first element with respect to the second element, now you can use this pair like this :





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