对于GCC和GCC版本中的每一个

how can I use for each loop in GCC?

如何在GCC中使用每个循环?

and how can i get GCC version? (in code)

我怎样才能获得GCC版本? (在代码中)

2 个解决方案

#1

Use a lambda, e.g.

使用lambda,例如

// C++0x only.
std::for_each(theContainer.begin(), theContainer.end(), [](someType x) {
    // do stuff with x.
});

The range-based for loop is supported by GCC since 4.6.

自4.6以来,GCC支持基于范围的for循环。

// C++0x only
for (auto x : theContainer) {
   // do stuff with x.
}

The "for each" loop syntax is an MSVC extension. It is not available in other compilers.

“for each”循环语法是MSVC扩展。它在其他编译器中不可用。

// MSVC only
for each (auto x in theContainer) {
  // do stuff with x.
}

But you could just use Boost.Foreach. It is portable and available without C++0x too.

但你可以使用Boost.Foreach。它是可移植的,也可以没有C ++ 0x。

// Requires Boost
BOOST_FOREACH(someType x, theContainer) {
  // do stuff with x.
}

See How do I test the current version of GCC ? on how to get the GCC version.

请参阅如何测试当前版本的GCC?关于如何获得GCC版本。

#2

there is also the traditionnal way, not using C++0X lambda. The <algorithm> header is designed to be used with objects that have a defined operator parenthesis. ( C++0x lambdas are only of subset of objects that have the operator () )

还有传统方式,不使用C ++ 0X lambda。标头设计用于具有已定义的运算符括号的对象。 (C ++ 0x lambdas只是具有operator()的对象的子集)

struct Functor
{
   void operator()(MyType& object)
   {
      // what you want to do on objects
   }
}

void Foo(std::vector<MyType>& vector)
{
  Functor functor;
  std::for_each(vector.begin(), vector.end(), functor);
}

see algorithm header reference for a list of all c++ standard functions that work with functors and lambdas.

请参阅算法标题参考,以获取与仿函数和lambda一起使用的所有c ++标准函数的列表。

#1