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39
40#ifndef QTCONCURRENT_COMPILERTEST_H
41#define QTCONCURRENT_COMPILERTEST_H
42
43#include <QtConcurrent/qtconcurrent_global.h>
44
45#ifndef QT_NO_CONCURRENT
46
47QT_BEGIN_NAMESPACE
48
49namespace QtPrivate {
50
51template<class T>
52class HasResultType {
53 typedef char Yes;
54 typedef void *No;
55 template<typename U> static Yes test(int, const typename U::result_type * = nullptr);
56 template<typename U> static No test(double);
57public:
58 enum { Value = (sizeof(test<T>(0)) == sizeof(Yes)) };
59};
60
61}
62
63QT_END_NAMESPACE
64
65#endif // QT_NO_CONCURRENT
66
67#endif
68

source code of qtbase/src/concurrent/qtconcurrentcompilertest.h