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22 lines
504 B
Markdown
22 lines
504 B
Markdown
# QPromiseUndefinedException
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*Since: 0.5.0*
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This exception is thrown when rejecting a promise with no explicit reason, for example:
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```cpp
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QPromise<int> promise([](const QPromiseResolve<int>& resolve, const QPromiseReject<int>& reject) {
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async_method([=](bool success, int result) {
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if (success) {
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resolve(result);
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} else {
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reject();
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}
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});
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});
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promise.fail([](const QPromiseUndefinedException&) {
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// promise rejected without reason!
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})
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```
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