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qtpromise/docs/qtpromise/exceptions/undefined.md
Simon Brunel 3c1461b8d0 Enhance the documentation and add markdown lint 
- Add npm package.json to make easier maintaining dependencies.
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2019-12-21 10:27:26 +01:00

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QPromiseUndefinedException

Since: 0.5.0

This exception is thrown when rejecting a promise with no explicit reason, for example:

QPromise<int> promise([](const QPromiseResolve<int>& resolve, const QPromiseReject<int>& reject) {
    async_method([=](bool success, int result) {
        if (success) {
            resolve(result);
        } else {
            reject();
        }
    });
});

promise.fail([](const QPromiseUndefinedException&) {
    // promise rejected without reason!
})