c++ - FC++ 是否适用于 g++ 4.5.0？

Question

FC++ 是一个用于 C++ 函数式编程的库。我在带有 gcc 4.5.0 的 MinGW 上使用它。当我使用更基本的功能时，我没有任何问题。但是更高级的功能之一是给我一个与模板相关的错误(或者可能只是我的代码有问题......不可能!)。

是否有人使用 4.5.0 的 FC++？看到我的代码有什么问题吗？

link text已经过时了，尽管它显示了 gcc 和模板特化问题的历史。 link text不是最新的。

这是我的代码:

#include <iostream>
#include "prelude.h"

using namespace fcpp;
using namespace std;

  struct TwoTimes  {
    template <class T>
    struct Sig : public FunType<T,T> {};

    template <class F>
    F operator() (const F& x) const { return 2*x; };
  } twoTimes;


int main(int argc, char* argv[] ) 
{
  cout << compose(twoTimes,twoTimes)(3) << endl;
  return 0;
}

我得到的错误是:

In file included from full.h:14:0,
             from lambda.h:38,
             from operator.h:29,
             from function.h:23,
             from reuse.h:14,
             from list.h:31,
             from prelude.h:32,
             from y.cxx:2:
smart.h: In instantiation of 'fcpp::FunctoidTraits<TwoTimes>':
prelude.h:142:74:   instantiated from 'fcpp::impl::XCompose::Sig<TwoTimes, TwoTimes>'
full.h:94:53:   instantiated from 'fcpp::Full2<fcpp::impl::XCompose>::Sig<TwoTimes, TwoTimes>'
y.cxx:18:46:   instantiated from here
smart.h:103:7: error: no type named 'Type' in 'struct   
      fcpp::impl::NeededASmartFunctoidButInsteadGot<TwoTimes, false>'
In file included from y.cxx:2:0:
prelude.h: In instantiation of 'fcpp::impl::XCompose::Sig<TwoTimes, TwoTimes>':
full.h:94:53:   instantiated from 'fcpp::Full2<fcpp::impl::XCompose>::Sig<TwoTimes, TwoTimes>'
y.cxx:18:46:   instantiated from here
prelude.h:142:74: error: 'fcpp::FunctoidTraits<TwoTimes>::max_args' is not a valid   
    template argument for type 'int' because it is a non-constant expression
In file included from lambda.h:38:0,
             from operator.h:29,
             from function.h:23,
             from reuse.h:14,
             from list.h:31,
             from prelude.h:32,
             from y.cxx:2:
full.h: In instantiation of 'fcpp::Full2<fcpp::impl::XCompose>::Sig<TwoTimes, TwoTimes>':
y.cxx:18:46:   
instantiated from here
full.h:94:53: error: no type named 'Arg1Type' in 'struct    
    fcpp::impl::XCompose::Sig<TwoTimes, TwoTimes>'
y.cxx: In function 'int main(int, char**)':
y.cxx:18:46: error: no match for call to '(fcpp::Compose) (TwoTimes&, TwoTimes&)'

Answer 1

嗯……您提到的链接已有七年历史了。在狗年和编译器时代，那是美好的一生。

如果您想要使用(当前)C++ 编译器进行函数式编程，可能是 Boost 中的一些可能对图书馆感兴趣？