[clang-tidy] Add a readability-deleted-default clang-tidy check.

Checks if constructors and assignment operators that are marked '= default' are
actually deleted by the compiler.

Patch by Alex Pilkiewicz!

Differential Revision: http://reviews.llvm.org/D18961

llvm-svn: 266190

2 files changed, 22 insertions, 0 deletions

diff --git a/clang-tools-extra/docs/clang-tidy/checks/list.rst b/clang-tools-extra/docs/clang-tidy/checks/list.rst
index 548028365ee..99414bceaac 100644
--- a/clang-tools-extra/docs/clang-tidy/checks/list.rst
+++ b/clang-tools-extra/docs/clang-tidy/checks/list.rst
@@ -98,6 +98,7 @@ Clang-Tidy Checks
    readability-avoid-const-params-in-decls
    readability-braces-around-statements
    readability-container-size-empty
+   readability-deleted-default
    readability-else-after-return
    readability-function-size
    readability-identifier-naming
diff --git a/clang-tools-extra/docs/clang-tidy/checks/readability-deleted-default.rst b/clang-tools-extra/docs/clang-tidy/checks/readability-deleted-default.rst
new file mode 100644
index 00000000000..3012911d279
--- /dev/null
+++ b/clang-tools-extra/docs/clang-tidy/checks/readability-deleted-default.rst
@@ -0,0 +1,21 @@
+.. title:: clang-tidy - readability-deleted-default
+
+readability-deleted-default
+===========================
+
+Checks that constructors and assignment operators marked as ``= default`` are
+not actually deleted by the compiler.
+
+.. code:: c++
+  class Example {
+  public:
+    // This constructor is deleted because I is missing a default value.
+    Example() = default;
+    // This is fine.
+    Example(const Example& Other) = default;
+    // This operator is deleted because I cannot be assigned (it is const).
+    Example& operator=(const Example& Other) = default;
+  private:
+    const int I;
+  };
+