Implementing std::conjunction and std::disjunction in C++11

How to Implement std::conjunction and std::disjunction in C++11

The std::conjunction and std::disjunction functions are two logical operations introduced with the introduction of the C++11 standard. They can be used to determine if a certain condition is true or false for a set of parameters.

The conjunction of two expressions is true if and only if both expressions are true. For example, if we were to define two conditions:

auto condition1 = [](){ return true; };
auto condition2 = [](){ return false; };

We can use the std::conjunction function to check if both conditions are ultimately true:

auto result = std::conjunction<decltype(condition1), decltype(condition2)>{}(condition1, condition2);

In this example, result will be equal to false, since one of the conditions is not true.

The disjunction of two expressions is true if at least one of the expressions is true. If we use our previous conditions as an example:

auto result = std::disjunction<decltype(condition1), decltype(condition2)>{}(condition1, condition2);

In this example, result will be equal to true, since one of the conditions is true.

The std::conjunction and std::disjunction functions make it very easy to evaluate conditions in a concise way. Using these functions can save you time and effort in your development projects.

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