a1a0b92b04
This will be used by the upcoming DSLParser, which needs to be able to put DSLExpression and DSLVar into containers such as std::vector and std::optional. Change-Id: I8d367cfd0b3a852a368c69a5b3be6c0eaa41d74a Reviewed-on: https://skia-review.googlesource.com/c/skia/+/404156 Commit-Queue: Ethan Nicholas <ethannicholas@google.com> Reviewed-by: John Stiles <johnstiles@google.com>
62 lines
1.3 KiB
C++
62 lines
1.3 KiB
C++
/*
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* Copyright 2021 Google LLC.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#ifndef SKSL_DSL_WRAPPER
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#define SKSL_DSL_WRAPPER
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#include <memory>
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namespace SkSL {
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namespace dsl {
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/**
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* Several of the DSL classes override operator= in a non-standard fashion to allow for expressions
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* like "x = 0" to compile into SkSL code. This makes it impossible to directly use these classes in
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* C++ containers which expect standard behavior for operator=.
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*
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* Wrapper<T> contains a T, where T is a DSL class with non-standard operator=, and provides
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* standard behavior for operator=, permitting it to be used in standard containers.
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*/
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template<typename T>
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class DSLWrapper {
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public:
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DSLWrapper(T value) {
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fValue.swap(value);
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}
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DSLWrapper(const DSLWrapper&) = delete;
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DSLWrapper(DSLWrapper&& other) {
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fValue.swap(other.fValue);
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}
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T& operator*() {
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return fValue;
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}
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T* operator->() {
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return &fValue;
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}
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DSLWrapper& operator=(const DSLWrapper&) = delete;
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DSLWrapper& operator=(DSLWrapper&& other) {
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fValue.swap(other.fValue);
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return *this;
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}
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private:
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T fValue;
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};
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} // namespace dsl
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} // namespace SkSL
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#endif
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