http://llvm.org/bugs/show_bug.cgi?id=19385
Bug ID: 19385
Summary: Adding static_asserts suppresses errors
Product: clang
Version: 3.4
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: C++11
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected]
Classification: Unclassified
Created attachment 12359
--> http://llvm.org/bugs/attachment.cgi?id=12359&action=edit
File demonstrating the bug
This program fails to compile with the error:
%%%% clang++ -std=c++11 static_assert.cpp %%%%
static_assert.cpp:17:38: error: no matching function for call to 'memoize'
std::cout << "1+" << val <<" = " << memoize<decltype(&increment),
int>(increment,std::move(val)) << std::endl;
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
static_assert.cpp:6:1: note: candidate template ignored: substitution failure
[with function_t = int (*)(int), Args = <int>]: implicit instantiation of
undefined template 'std::result_of<int (*(int))(int)>'
memoize(function_t f, Args&&...a) {
^
When the debug flag is enabled, compilation succeeds. (clang++ -std=c++11
-DDEBUG static_assert.cpp)
Since the only difference between the two is the presence of a static_assert,
this violates ยง7.0.4: "... If the value of the expression when so converted is
true, the declaration has no effect."
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