qt5base-lts/src/corelib/concurrent/qtconcurrentcompilertest.h

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#ifndef QTCONCURRENT_COMPILERTEST_H
#define QTCONCURRENT_COMPILERTEST_H

#include <QtCore/qglobal.h>

#ifndef QT_NO_CONCURRENT

QT_BEGIN_HEADER
QT_BEGIN_NAMESPACE

QT_MODULE(Core)

#if defined (Q_CC_MSVC) && (_MSC_VER < 1300)
#  define QT_TYPENAME
#else
#  define QT_TYPENAME typename
#endif

namespace QtPrivate {

template<class T>
class HasResultType {
    typedef char Yes;
    typedef void *No;
    template<typename U> static Yes test(int, const typename U::result_type * = 0);
    template<typename U> static No test(double);
public:
    enum { Value = (sizeof(test<T>(0)) == sizeof(Yes)) };
};

}

QT_END_NAMESPACE
QT_END_HEADER

#endif // QT_NO_CONCURRENT

#endif