在std :: map中存储boost :: bind函数 [英] Storing boost::bind functions in a std::map

问题描述

我创建了一堆函数，它们都有效地做同样的事情：

I'm creating a bunch of functions which all effectively do the same thing:

long Foo::check(long retValue, unsigned toCheck, const std::set<unsigned>& s)
{
    auto it = s.find(toCheck);
    return (it == s.end()) ? -retValue : retValue;
}

其中Foo是一个类。到目前为止所有相当简单。现在，我真的想创建很多变体，但绑定到不同的集合。然后我想把它们存储在std :: map中。所以，使用boost :: bind和boost :: function，做一些类似：

where Foo is a class. All fairly simple so far. Now, I effectively want to create a lot of variants on this, but bound to different sets. I then want to store these in a std::map. So, using boost::bind and boost::function, do something like:

void Foo::addToMap(unsigned option, const std::set<unsigned>& currentSet)
{
    someMap[option] = boost::bind(&Foo::check, this, _1, _2, currentSet);
}

我遇到的问题是尝试定义地图的类型。我认为这是：

The problem I'm having is trying to define the type of the map. I thought it would be:

std::map<unsigned, boost::function<long (long, unsigned)> > someMap;

<函数在'boost :: function< Signature>'中不可用。

映射的第二个模板参数究竟应该是什么？

What exactly should the second template argument to map be?

推荐答案

我解决了。我包括错误的头文件;而不是：

Ah I solved it. I was including the wrong header file; instead of:

#include< boost / function.hpp>

我在boost / function文件夹中包含了以下内容：

I was including things from the boost/function folder like:

#include< boost / function / function_fwd.hpp> ;

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