这是我来自 Boost 库的 C++ 代码。当我尝试为我的带有 ARM 处理器的 QNX 编译这段代码时，它抛出了 2 个错误 -
- '_FCbuild'不能作为函数使用
- 在“(”标记之前需要“>”
这两个错误都是在下面的代码处抛出的
template<class T, std::size_t I, unsigned N>
struct extent<T[I], N>
{
static const std::size_t value = extent<T, N-1>::value;
};
一切看起来都很好..但不确定为什么会抛出此错误..有人遇到过类似的错误并解决了吗？？
完整代码如下:
#ifndef BOOST_MOVE_UNIQUE_PTR_DETAIL_META_UTILS_HPP
#define BOOST_MOVE_UNIQUE_PTR_DETAIL_META_UTILS_HPP
#ifndef BOOST_CONFIG_HPP
# include <boost/config.hpp>
#endif
#
#if defined(BOOST_HAS_PRAGMA_ONCE)
# pragma once
#endif
#include <cstddef> //for std::size_t
//Small meta-typetraits to support move
namespace boost {
namespace movelib {
template <class T>
struct default_delete;
} //namespace movelib {
#ifdef BOOST_NO_CXX11_RVALUE_REFERENCES
//Forward declare boost::rv
template <class T> class rv;
#endif
namespace move_upmu {
//////////////////////////////////////
// nat
//////////////////////////////////////
struct nat{};
//////////////////////////////////////
// natify
//////////////////////////////////////
template <class T> struct natify{};
//////////////////////////////////////
// if_c
//////////////////////////////////////
template<bool C, typename T1, typename T2>
struct if_c
{
typedef T1 type;
};
template<typename T1, typename T2>
struct if_c<false,T1,T2>
{
typedef T2 type;
};
//////////////////////////////////////
// if_
//////////////////////////////////////
template<typename T1, typename T2, typename T3>
struct if_ : if_c<0 != T1::value, T2, T3>
{};
//enable_if_
template <bool B, class T = nat>
struct enable_if_c
{
typedef T type;
};
//////////////////////////////////////
// enable_if_c
//////////////////////////////////////
template <class T>
struct enable_if_c<false, T> {};
//////////////////////////////////////
// enable_if
//////////////////////////////////////
template <class Cond, class T = nat>
struct enable_if : public enable_if_c<Cond::value, T> {};
//////////////////////////////////////
// remove_reference
//////////////////////////////////////
template<class T>
struct remove_reference
{
typedef T type;
};
template<class T>
struct remove_reference<T&>
{
typedef T type;
};
#ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
template<class T>
struct remove_reference<T&&>
{
typedef T type;
};
#else
template<class T>
struct remove_reference< rv<T> >
{
typedef T type;
};
template<class T>
struct remove_reference< rv<T> &>
{
typedef T type;
};
template<class T>
struct remove_reference< const rv<T> &>
{
typedef T type;
};
#endif
//////////////////////////////////////
// remove_const
//////////////////////////////////////
template< class T >
struct remove_const
{
typedef T type;
};
template< class T >
struct remove_const<const T>
{
typedef T type;
};
//////////////////////////////////////
// remove_volatile
//////////////////////////////////////
template< class T >
struct remove_volatile
{
typedef T type;
};
template< class T >
struct remove_volatile<volatile T>
{
typedef T type;
};
//////////////////////////////////////
// remove_cv
//////////////////////////////////////
template< class T >
struct remove_cv
{
typedef typename remove_volatile
<typename remove_const<T>::type>::type type;
};
//////////////////////////////////////
// remove_extent
//////////////////////////////////////
template<class T>
struct remove_extent
{
typedef T type;
};
template<class T>
struct remove_extent<T[]>
{
typedef T type;
};
template<class T, std::size_t N>
struct remove_extent<T[N]>
{
typedef T type;
};
//////////////////////////////////////
// extent
//////////////////////////////////////
template<class T, unsigned N = 0>
struct extent
{
static const std::size_t value = 0;
};
template<class T>
struct extent<T[], 0>
{
static const std::size_t value = 0;
};
template<class T, std::size_t I, unsigned N>
struct extent<T[I], N>
{
static const std::size_t value = extent<T, N-1>::value;
};
template<class T, unsigned N>
struct extent<T[], N>
{
static const std::size_t value = extent<T, N-1>::value;
};
template<class T, std::size_t N>
struct extent<T[N], 0>
{
static const std::size_t value = N;
};
//////////////////////////////////////
// add_lvalue_reference
//////////////////////////////////////
template<class T>
struct add_lvalue_reference
{
typedef T& type;
};
template<class T>
struct add_lvalue_reference<T&>
{
typedef T& type;
};
template<>
struct add_lvalue_reference<void>
{
typedef void type;
};
template<>
struct add_lvalue_reference<const void>
{
typedef const void type;
};
template<>
struct add_lvalue_reference<volatile void>
{
typedef volatile void type;
};
template<>
struct add_lvalue_reference<const volatile void>
{
typedef const volatile void type;
};
template<class T>
struct add_const_lvalue_reference
{
typedef typename remove_reference<T>::type t_unreferenced;
typedef const t_unreferenced t_unreferenced_const;
typedef typename add_lvalue_reference
<t_unreferenced_const>::type type;
};
//////////////////////////////////////
// is_same
//////////////////////////////////////
template<class T, class U>
struct is_same
{
static const bool value = false;
};
template<class T>
struct is_same<T, T>
{
static const bool value = true;
};
//////////////////////////////////////
// is_pointer
//////////////////////////////////////
template< class T >
struct is_pointer
{
static const bool value = false;
};
template< class T >
struct is_pointer<T*>
{
static const bool value = true;
};
//////////////////////////////////////
// is_reference
//////////////////////////////////////
template< class T >
struct is_reference
{
static const bool value = false;
};
template< class T >
struct is_reference<T&>
{
static const bool value = true;
};
#ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
template< class T >
struct is_reference<T&&>
{
static const bool value = true;
};
#endif
//////////////////////////////////////
// is_lvalue_reference
//////////////////////////////////////
template<class T>
struct is_lvalue_reference
{
static const bool value = false;
};
template<class T>
struct is_lvalue_reference<T&>
{
static const bool value = true;
};
//////////////////////////////////////
// is_array
//////////////////////////////////////
template<class T>
struct is_array
{
static const bool value = false;
};
template<class T>
struct is_array<T[]>
{
static const bool value = true;
};
template<class T, std::size_t N>
struct is_array<T[N]>
{
static const bool value = true;
};
//////////////////////////////////////
// has_pointer_type
//////////////////////////////////////
template <class T>
struct has_pointer_type
{
struct two { char c[2]; };
template <class U> static two test(...);
template <class U> static char test(typename U::pointer* = 0);
static const bool value = sizeof(test<T>(0)) == 1;
};
//////////////////////////////////////
// pointer_type
//////////////////////////////////////
template <class T, class D, bool = has_pointer_type<D>::value>
struct pointer_type_imp
{
typedef typename D::pointer type;
};
template <class T, class D>
struct pointer_type_imp<T, D, false>
{
typedef typename remove_extent<T>::type* type;
};
template <class T, class D>
struct pointer_type
{
typedef typename pointer_type_imp
<typename remove_extent<T>::type, typename remove_reference<D>::type>::type type;
};
//////////////////////////////////////
// is_convertible
//////////////////////////////////////
#if defined(_MSC_VER) && (_MSC_VER >= 1400)
//use intrinsic since in MSVC
//overaligned types can't go through ellipsis
template <class T, class U>
struct is_convertible
{
static const bool value = __is_convertible_to(T, U);
};
#else
template <class T, class U>
class is_convertible
{
typedef typename add_lvalue_reference<T>::type t_reference;
typedef char true_t;
class false_t { char dummy[2]; };
static false_t dispatch(...);
static true_t dispatch(U);
static t_reference trigger();
public:
static const bool value = sizeof(dispatch(trigger())) == sizeof(true_t);
};
#endif
//////////////////////////////////////
// is_unary_function
//////////////////////////////////////
#if defined(BOOST_MSVC) || defined(__BORLANDC_)
#define BOOST_MOVE_TT_DECL __cdecl
#else
#define BOOST_MOVE_TT_DECL
#endif
#if defined(_MSC_EXTENSIONS) && !defined(__BORLAND__) && !defined(_WIN64) && !defined(_M_ARM) && !defined(UNDER_CE)
#define BOOST_MOVE_TT_TEST_MSC_FUNC_SIGS
#endif
template <typename T>
struct is_unary_function_impl
{ static const bool value = false; };
// avoid duplicate definitions of is_unary_function_impl
#ifndef BOOST_MOVE_TT_TEST_MSC_FUNC_SIGS
template <typename R>
struct is_unary_function_impl<R (*)()>
{ static const bool value = true; };
template <typename R>
struct is_unary_function_impl<R (*)(...)>
{ static const bool value = true; };
#else // BOOST_MOVE_TT_TEST_MSC_FUNC_SIGS
template <typename R>
struct is_unary_function_impl<R (__stdcall*)()>
{ static const bool value = true; };
#ifndef _MANAGED
template <typename R>
struct is_unary_function_impl<R (__fastcall*)()>
{ static const bool value = true; };
#endif
template <typename R>
struct is_unary_function_impl<R (__cdecl*)()>
{ static const bool value = true; };
template <typename R>
struct is_unary_function_impl<R (__cdecl*)(...)>
{ static const bool value = true; };
#endif
// avoid duplicate definitions of is_unary_function_impl
#ifndef BOOST_MOVE_TT_TEST_MSC_FUNC_SIGS
template <typename R, class T0>
struct is_unary_function_impl<R (*)(T0)>
{ static const bool value = true; };
template <typename R, class T0>
struct is_unary_function_impl<R (*)(T0...)>
{ static const bool value = true; };
#else // BOOST_MOVE_TT_TEST_MSC_FUNC_SIGS
template <typename R, class T0>
struct is_unary_function_impl<R (__stdcall*)(T0)>
{ static const bool value = true; };
#ifndef _MANAGED
template <typename R, class T0>
struct is_unary_function_impl<R (__fastcall*)(T0)>
{ static const bool value = true; };
#endif
template <typename R, class T0>
struct is_unary_function_impl<R (__cdecl*)(T0)>
{ static const bool value = true; };
template <typename R, class T0>
struct is_unary_function_impl<R (__cdecl*)(T0...)>
{ static const bool value = true; };
#endif
template <typename T>
struct is_unary_function_impl<T&>
{ static const bool value = false; };
template<typename T>
struct is_unary_function
{ static const bool value = is_unary_function_impl<T>::value; };
//////////////////////////////////////
// has_virtual_destructor
//////////////////////////////////////
#if (defined(BOOST_MSVC) && defined(BOOST_MSVC_FULL_VER) && (BOOST_MSVC_FULL_VER >=140050215))\
|| (defined(BOOST_INTEL) && defined(_MSC_VER) && (_MSC_VER >= 1500))
# define BOOST_MOVEUP_HAS_VIRTUAL_DESTRUCTOR(T) __has_virtual_destructor(T)
#elif defined(BOOST_CLANG) && defined(__has_feature)
# if __has_feature(has_virtual_destructor)
# define BOOST_MOVEUP_HAS_VIRTUAL_DESTRUCTOR(T) __has_virtual_destructor(T)
# endif
#elif defined(__GNUC__) && ((__GNUC__ > 4) || ((__GNUC__ == 4) && (__GNUC_MINOR__ >= 3) && !defined(__GCCXML__))) && !defined(BOOST_CLANG)
# define BOOST_MOVEUP_HAS_VIRTUAL_DESTRUCTOR(T) __has_virtual_destructor(T)
#elif defined(__ghs__) && (__GHS_VERSION_NUMBER >= 600)
# define BOOST_MOVEUP_HAS_VIRTUAL_DESTRUCTOR(T) __has_virtual_destructor(T)
#elif defined(__CODEGEARC__)
# define BOOST_MOVEUP_HAS_VIRTUAL_DESTRUCTOR(T) __has_virtual_destructor(T)
#endif
#ifdef BOOST_MOVEUP_HAS_VIRTUAL_DESTRUCTOR
template<class T>
struct has_virtual_destructor{ static const bool value = BOOST_MOVEUP_HAS_VIRTUAL_DESTRUCTOR(T); };
#else
//If no intrinsic is available you trust the programmer knows what is doing
template<class T>
struct has_virtual_destructor{ static const bool value = true; };
#endif
//////////////////////////////////////
// missing_virtual_destructor
//////////////////////////////////////
template< class T, class U
, bool enable = is_convertible< U*, T*>::value &&
!is_array<T>::value &&
!is_same<typename remove_cv<T>::type, void>::value &&
!is_same<typename remove_cv<U>::type, typename remove_cv<T>::type>::value
>
struct missing_virtual_destructor_default_delete
{ static const bool value = !has_virtual_destructor<T>::value; };
template<class T, class U>
struct missing_virtual_destructor_default_delete<T, U, false>
{ static const bool value = false; };
template<class Deleter, class U>
struct missing_virtual_destructor
{ static const bool value = false; };
template<class T, class U>
struct missing_virtual_destructor< ::boost::movelib::default_delete<T>, U >
: missing_virtual_destructor_default_delete<T, U>
{};
} //namespace move_upmu {
} //namespace boost {
#endif //#ifndef BOOST_MOVE_UNIQUE_PTR_DETAIL_META_UTILS_HPP
最佳答案
简单添加
#undef I
在 Boost 使用 I 作为模板参数的任何地方之前，你会得到这个错误。
问题是 QNX complex.h 定义了一个名为 I 的宏，而 Boost 在某些 header 中使用 I 作为模板参数:
template<class T, std::size_t I, unsigned N>
编译器将 I 替换为来自 complex.h 的宏定义。
我在我的博文中详细讨论了这个问题: https://cppisland.wordpress.com/2018/03/04/compiling-boost-on-qnx-a-tale-of-why-modules-are-needed-in-c/
关于c++ - “_FCbuild”不能用作函数 - C/C++ 代码错误，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/43450533/