xCode 4.2中的未知类型名称'namespace'？

Question

我正在编译QCAR SDK，但在我向项目中添加了更多框架后会出现错误。

// Matrices.h
//
#ifndef _QCAR_MATRIX_H_
#define _QCAR_MATRIX_H_

namespace QCAR
{

/// Matrix with 3 rows and 4 columns of float items
struct Matrix34F {
    float data[3*4];   ///< Array of matrix items
};


/// Matrix with 4 rows and 4 columns of float items
struct Matrix44F {
    float data[4*4];   ///< Array of matrix items
};

} // namespace QCAR

#endif //_QCAR_MATRIX_H_

在namespace QCAR行中，它说Unknown type name 'namespace'。

我该怎么办？

更新：这是构建脚本

In file included from ../../build/include/QCAR/Tool.h:18:
In file included from /Users/Raptor.Kwok/Documents/xCodeProjects/qcar-ios-1-0-0/samples/ImageTargets/ImageTargets/EAGLView.h:14:
In file included from /Users/Raptor.Kwok/Documents/xCodeProjects/qcar-ios-1-0-0/samples/ImageTargets/ImageTargets/ImageTargetsAppDelegate.h:9:
In file included from /Users/Raptor.Kwok/Documents/xCodeProjects/qcar-ios-1-0-0/samples/ImageTargets/CouponBook.m:12:
../../build/include/QCAR/Matrices.h:16:1: error: unknown type name 'namespace' [1]
 namespace QCAR
 ^
../../build/include/QCAR/Matrices.h:16:15: error: expected ';' after top level declarator [1]
 namespace QCAR
               ^
               ;
fix-it:"../../build/include/QCAR/Matrices.h":{16:15-16:15}:";"
In file included from /Users/Raptor.Kwok/Documents/xCodeProjects/qcar-ios-1-0-0/samples/ImageTargets/ImageTargets/ImageTargetsAppDelegate.h:9:
In file included from /Users/Raptor.Kwok/Documents/xCodeProjects/qcar-ios-1-0-0/samples/ImageTargets/CouponBook.m:12:
/Users/Raptor.Kwok/Documents/xCodeProjects/qcar-ios-1-0-0/samples/ImageTargets/ImageTargets/EAGLView.h:52:5: error: type name requires a specifier or qualifier [1]
     QCAR::Matrix44F projectionMatrix;
     ^
/Users/Raptor.Kwok/Documents/xCodeProjects/qcar-ios-1-0-0/samples/ImageTargets/ImageTargets/EAGLView.h:52:10: error: expected expression [1]
     QCAR::Matrix44F projectionMatrix;
          ^
/Users/Raptor.Kwok/Documents/xCodeProjects/qcar-ios-1-0-0/samples/ImageTargets/ImageTargets/EAGLView.h:52:5:{52:5-52:9}: warning: type specifier missing, defaults to 'int' [-Wimplicit-int,3]
     QCAR::Matrix44F projectionMatrix;
     ^~~~
1 warning and 4 errors generated.

Answer 1

您可以使用.mm重命名文件，也可以选择.m文件并将“文件类型”更改为“Objective-C ++ Source”。

Answer 2

我怀疑翻译是C或Objective-C，其中namespace不是C ++和Objective-C ++中的关键字。

另一种可能性是前一个标题没有关闭一个正文（例如在函数定义结束时忘记};的类声明结束时忘记了}。