C++ 错误：需要类型说明符
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C++ Error: Expected a type specifier
提问by Xenoprimate
When I try to use a LoggerStreamlike this, I get 'expected a type specifier':
当我尝试使用这样的 a 时LoggerStream，我得到“期望一个类型说明符”：
const LoggerStream logger(L"Test Component");
const LoggerStream logger(L"Test Component");
Here's where I'm trying to use the LoggerStream:
这是我尝试使用的地方LoggerStream：
#include "Logger.h"
#include "TestComponent.h"
namespace ophRuntime {
struct TestComponent::TestComponentImpl {
private:
LoggerStream logger(L"Test Component");
NO_COPY_OR_ASSIGN(TestComponentImpl);
};
TestComponent::TestComponent() : impl(new TestComponentImpl()) {
}
bool TestComponent::Init() {
}
}
回答by Roddy
You can't construct class members like this:-
你不能像这样构造类成员：-
struct TestComponent::TestComponentImpl
{
private:
LoggerStream logger(L"Test Component");
Instead, use an initialization list in the constuctor, like this:
相反，在构造函数中使用初始化列表，如下所示：
struct TestComponent::TestComponentImpl
{
LoggerStream logger;
TestComponent::TestComponent() : impl(new TestComponentImpl()),
logger("L"Test Component")
{
}
...
}
And I think you've fallen foul of the "Most Vexing Parse"because the compiler thinks loggermust be a function, and it's complaining that L"Test Component"is not a type specifier for a parameter.
而且我认为您已经违反了“最烦人的解析”，因为编译器认为logger必须是一个函数，并且它抱怨它L"Test Component"不是参数的类型说明符。
回答by John Kugelman
Do you mention the namespace anywhere? You need to write either:
你有没有在任何地方提到命名空间？你需要写：
using ophRuntime::LoggerStream;
const LoggerStream logger(L"Test Component");
or
或者
using namespace ophRuntime;
const LoggerStream logger(L"Test Component");
or
或者
const ophRuntime::LoggerStream logger(L"Test Component");
回答by Sebastian Hoffmann
LoggerStreamis in namespace ophRuntimethus your definition has to be
LoggerStream在命名空间中，ophRuntime因此您的定义必须是
const ophRuntime::LoggerStream logger(L"Test Component");
回答by Alex Antonov
You need to use the namespace name ophRuntimewhen use the class LoggerStream:
ophRuntime使用类时需要使用命名空间名称LoggerStream：
const ophRuntime::LoggerStream logger(L"Test Component");
