Xcode 编译 C++ 时出错预期的成员名称或“;”声明说明符之后

Xcode error compiling c++ Expected member name or ';' after declaration specifiers

我尝试在 Xcode 中编译的 C++ 库 (openNN) 中的检查方法有问题。我将使用其中一种方法的示例,因为我怀疑它们都是由同一问题引起的。

Header 出现错误的声明:
预期成员名称或“;”在声明说明符之后。

void check(void) const;

函数定义:

void InverseSumSquaredError::check(void) const
{
    std::ostringstream buffer;

    // Neural network stuff

    if(!neural_network_pointer)
    {
       buffer << "OpenNN Exception: InverseSumSquaredError class.\n"
              << "void check(void) const method.\n"
              << "Pointer to neural network is NULL.\n";

       throw std::logic_error(buffer.str().c_str());      
    }

    const MultilayerPerceptron* multilayer_perceptron_pointer = neural_network_pointer->get_multilayer_perceptron_pointer();

    if(!multilayer_perceptron_pointer)
    {
       buffer << "OpenNN Exception: InverseSumSquaredError class.\n"
              << "void check(void) const method.\n"
              << "Pointer to multilayer perceptron is NULL.\n";

       throw std::logic_error(buffer.str().c_str());      
    }

    const unsigned int inputs_number = multilayer_perceptron_pointer->count_inputs_number();
    const unsigned int outputs_number = multilayer_perceptron_pointer->count_outputs_number();

    if(inputs_number == 0)
    {
       buffer << "OpenNN Exception: InverseSumSquaredError class.\n"
              << "void check(void) const method.\n"
              << "Number of inputs in multilayer perceptron object is zero.\n";

       throw std::logic_error(buffer.str().c_str());      
    }

    if(outputs_number == 0)
    {
       buffer << "OpenNN Exception: InverseSumSquaredError class.\n"
         << "void check(void) const method.\n"
         << "Number of outputs in multilayer perceptron object is zero.\n";

       throw std::logic_error(buffer.str().c_str());      
    }

    // Mathematical model stuff

    if(!mathematical_model_pointer)
    {
        buffer << "OpenNN Exception: InverseSumSquaredError class.\n"
               << "void check(void) const method.\n"
               << "Pointer to mathematical model is NULL.\n";

        throw std::logic_error(buffer.str().c_str());     
    }

    // Data set stuff 

    if(!data_set_pointer)
    {
       buffer << "OpenNN Exception: InverseSumSquaredError class.\n"
              << "void check(void) const method.\n"
              << "Pointer to data set is NULL.\n";

       throw std::logic_error(buffer.str().c_str());      
    }

    // Final solutions error stuff

}

如果我将 header 中的定义更改为
void InverseSumSquaredError::check(void) const;
我最终遇到错误:
会员额外资格'check'

我目前正在使用方言 C++98 和库 libc++。 Xcode 设置为将源代码编译为 Objective-C++,它会处理大多数其他错误。

我想不出与此问题相关的任何其他内容,它让我困惑了几个小时,因此非常感谢任何类型的帮助。

不知道您的确切设置,但有 historical reports 源代码引用 AssertMacros.h 并且还有一些 check 方法的定义。在我的测试代码中:

#include <stdio.h>
#include <AssertMacros.h>

class InverseSumSquaredError {
public:
   void check(void) const;
}

我观察到同样的错误。包括行:

#define __ASSERT_MACROS_DEFINE_VERSIONS_WITHOUT_UNDERSCORES 0

在包含 AssertMacros.h 之前解决了这个问题。