如何使用lambda函数与boost :: bind / std :: bind在VC ++ 2010？ [英] How to use lambda functions with boost::bind/std::bind in VC++ 2010?

问题描述

我有一些lambda函数，我想使用boost :: bind或std :: bind绑定。不幸的是，他们给我不同的编译器错误：

I have some lambda functions which I want to bind using either boost::bind or std::bind. (Don't care which one, as long as it works.) Unfortunately both of them give me different compiler erros:

auto f = [](){ cout<<"f()"<<endl; };
auto f2 = [](int x){ cout<<"f2() x="<<x<<endl; };

std::bind(f)(); //ok
std::bind(f2, 13)(); //error C2903: 'result' : symbol is neither a class template nor a function template

boost::bind(f)(); //error C2039: 'result_type' : is not a member of '`anonymous-namespace'::<lambda0>'
boost::bind(f2, 13)(); //error C2039: 'result_type' : is not a member of '`anonymous-namespace'::<lambda1>'

那么，最简​​单的解决方法是什么？

So, what is the simplest workaround for this?

推荐答案

您需要手动指定返回类型：

You need to manually specify the return type:

boost::bind<void>(f)();
boost::bind<int>(f2, 13)();

你也可以自己写一个模板函数来自动推导出使用Boost.FunctionTypes检查的返回类型你的lambda的operator（），如果你不喜欢显式地告诉bind。

You can also write yourself a template-function to deduce the return type automagically using Boost.FunctionTypes to inspect your lambda's operator(), if you don't like to explicitly tell bind.

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