为什么不超载计数 [英] why not overload count

问题描述

我们在STL中具有count()和count_if()，为什么不像next_find()那样重载count()函数呢?谢谢！

we have count() and count_if() in STL, why not just overload the count() function like adjacent_find() does? Thanks!

推荐答案

区别在于count和count_if具有相同数量的参数(3)，而adjacent_find具有2个参数，非参数谓词版本vs谓词1中的3.

当然，对于非模板函数或模板概念(从C ++ 0x投票和删除)来说，这都不是问题，但是对于C ++函数模板的当前实现，这是一个问题.

The difference is that count and count_if have the same number of parameters (3) and adjacent_find has 2 parameters in the non-predicate version vs 3 in the predicate one.

Of course, that wouldn''t be a problem with non-template functions, or with template concepts (voted and removed from C++ 0x), but with the current implementation of C++ function templates it is.

这篇关于为什么不超载计数的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！