function-object

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Temporary function object in a for loop

Does the function object randomElementByWeight constructor get called for every iteration through the loop or can the compiler optimize this away somehow? I want to make sure the rand function is call[详细]

2023-03-20 04:35 分类：问答
How to execute unary function objects of different parameter type in sequence?

I\'m designing a mechanism that will execute a set of unary function objects in sequence. These function objects are assigned during runtime, and the problem is: the parameter type of these function o[详细]

2023-03-18 19:24 分类：问答
C++ equivalent of C#'s Func<T, TResult>

The following code computes the average of a particular property of T in the items collection: public double Average<T>(IList<T> items, Func<T, double> selector)[详细]

2023-03-12 04:35 分类：问答
Detecting function object (functor) and lambda traits

How can I detect the return type and parameter types of nullary and unary function pointers, std::function objects, and functors (including lambdas)?[详细]

2023-03-09 23:01 分类：问答
Using std::tm as Key in std::map

I\'d like to use std::tm () as the key for an std::map-container. But when I try to compile it, I get a lot(10) of errors.[详细]

2023-03-05 04:42 分类：问答
Why can C++ functors be preferable to objects with named methods?

I recently have got excited by functors and been using them all over the place.Then the situation arose where I needed my functor to perform two different operations and I thought about adding another[详细]

2023-02-22 15:18 分类：问答
Using STL algorithms with shared_ptr, function objects

I have a set of shared_ptr, and I\'d like to use remove_copy_if with a custom function object for the predicate.I didn\'t know the \"best\" way to do it.Right now, I\'ve got this working:[详细]

2023-02-19 15:44 分类：问答
How can I use std::generate/generate_n with a polymorphic function object?

I\'m new to std::generate and have attempted to structure a program which uses it to initialize vectors. However it\'s behaving differently to my expectations.[详细]

2023-02-11 05:12 分类：问答
Help understanding the working of Function Objects?

I found this code on Wikipedia class compare_class { public: bool operator()(int A, int B) const { return A < B;[详细]

2023-02-07 20:16 分类：问答
Detailed difference between functor's call and function call?

The key reason this works is that for_each () doesn’t actually assume its third argument to be a function.[详细]

2023-01-19 21:44 分类：问答