[C++ API] Make error message for empty module friendlier#9565
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goldsborough wants to merge 2 commits intopytorch:masterfrom
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[C++ API] Make error message for empty module friendlier#9565goldsborough wants to merge 2 commits intopytorch:masterfrom
goldsborough wants to merge 2 commits intopytorch:masterfrom
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ebetica
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Jul 18, 2018
| std::is_default_constructible<Contained>::value, | ||
| "You are trying to default construct a module which has " | ||
| "no default constructor. Use = nullptr to give it the empty state " | ||
| "(like an empty std::shared_ptr)."); |
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@pytorchbot retest this please |
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@pytorchbot retest this please |
ezyang
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Jul 19, 2018
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I'll note that C++ newbies never read static_assert error messages, but there's not really much we can do here...
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@pytorchbot retest this please |
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@ezyang Well, the previous error message did not even have the line pointing to the exact error, so I consider this a big win :D |
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@pytorchbot retest this please |
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jramseyer
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Jul 30, 2018
Summary:
In our pimpl system, default constructing a module holder default constructs the contained module. This means `Linear linear;` is ill-formed, since `Linear` doesn't have a default constructor. Instead we require `Linear linear = nullptr;` to get the empty state of the `Linear`. This PR makes the error message for the ill-formed case nicer.
I had to change the forwarding constructors of most of our modules for this, but that's a minor adjustment.
E.g.
```
Linear linear;
In file included from /home/psag/pytorch/pytorch/torch/csrc/api/include/torch/nn/module.h:5:0,
from /home/psag/pytorch/pytorch/test/cpp/api/module.cpp:3:
/home/psag/pytorch/pytorch/torch/csrc/api/include/torch/nn/pimpl.h: In instantiation of ‘torch::nn::ModuleHolder<Contained>::ModuleHolder() [with Contained = torch::nn::LinearImpl]’:
/home/psag/pytorch/pytorch/torch/csrc/api/include/torch/nn/modules/dropout.h:45:1: required from here
/home/psag/pytorch/pytorch/torch/csrc/api/include/torch/nn/pimpl.h:46:5: error: static assertion failed: You are trying to default construct a module which has no default constructor. Use = nullptr to give it the empty state (like an empt
y std::shared_ptr).
static_assert(
```
ebetica ezyang
Pull Request resolved: pytorch#9565
Differential Revision: D8903666
Pulled By: goldsborough
fbshipit-source-id: 5e6b788921a27a44359db89afdc2b057facc5cec
goodlux
pushed a commit
to goodlux/pytorch
that referenced
this pull request
Aug 15, 2018
Summary:
In our pimpl system, default constructing a module holder default constructs the contained module. This means `Linear linear;` is ill-formed, since `Linear` doesn't have a default constructor. Instead we require `Linear linear = nullptr;` to get the empty state of the `Linear`. This PR makes the error message for the ill-formed case nicer.
I had to change the forwarding constructors of most of our modules for this, but that's a minor adjustment.
E.g.
```
Linear linear;
In file included from /home/psag/pytorch/pytorch/torch/csrc/api/include/torch/nn/module.h:5:0,
from /home/psag/pytorch/pytorch/test/cpp/api/module.cpp:3:
/home/psag/pytorch/pytorch/torch/csrc/api/include/torch/nn/pimpl.h: In instantiation of ‘torch::nn::ModuleHolder<Contained>::ModuleHolder() [with Contained = torch::nn::LinearImpl]’:
/home/psag/pytorch/pytorch/torch/csrc/api/include/torch/nn/modules/dropout.h:45:1: required from here
/home/psag/pytorch/pytorch/torch/csrc/api/include/torch/nn/pimpl.h:46:5: error: static assertion failed: You are trying to default construct a module which has no default constructor. Use = nullptr to give it the empty state (like an empt
y std::shared_ptr).
static_assert(
```
ebetica ezyang
Pull Request resolved: pytorch#9565
Differential Revision: D8903666
Pulled By: goldsborough
fbshipit-source-id: 5e6b788921a27a44359db89afdc2b057facc5cec
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In our pimpl system, default constructing a module holder default constructs the contained module. This means
Linear linear;is ill-formed, sinceLineardoesn't have a default constructor. Instead we requireLinear linear = nullptr;to get the empty state of theLinear. This PR makes the error message for the ill-formed case nicer.I had to change the forwarding constructors of most of our modules for this, but that's a minor adjustment.
E.g.
@ebetica @ezyang