C++探究Undefined reference to static constexpr 背景# 在某个class中定义了static constexpr size_t value变量,调用如下: std::vector<std::pair<size_t,size_t>> vec;vec.push_back({0, value}); release编译可以通过,debug编译时报错Undefined reference to XXX::value。 分析# 对于gcc而言constexpr变量属...
// .hpp struct foo { void bar(); static constexpr char baz[] = "quz"; }; // .cpp void foo::bar() { std::string str(baz); // undefined reference to baz } c++ c++11 static-members constexpr Share Improve this question Follow edited Apr 18, 2016 at 18:02 asked Nov 4, ...
template <typename T> void foo(const T & a) { /* code */ } // This would also fail // void foo(const int & a) { /* code */ } class Bar { public: static const int kConst = 1; void func() { foo(kConst); // This is the important line } }; int main() { Bar b;...
static constexpr遇到的undefined 问题 classSolution {staticconstexprintcheck[10] = {0,0,1, -1, -1,1,1, -1,0,1};public:introtatedDigits(intn) {intans =0;for(inti =1; i <= n; ++i) { std::stringnum =std::to_string(i);boolvalid =true, diff =false;for(charch: num) {if...
Depending on the compiler and sometimes the build type, I have undefined references to static constexpr member variable fbgemm::BCSRMatrix<signed char, 1, 4>::COLTILE. Here is the error with apple-clang 12 on Macos with fbgemm shared and...
Hi, all. When struct(or class) member variable(static const) is used in EXPECT_EQ, it occurs "undefined reference" link error, meanwhile, it's Ok in EXPECT_TRUE. Thanks in advance. #include <gtest/gtest.h> struct Obj { static const int a...
因为没有人为std::reference_wrapper写过requires (!std::is_void_v<T>)这个概念。我同意,void不应该对std::reference_wrapper有效,允许void可能是标准的疏忽。 你可能认为std::reference_wrapper<void>无论如何都不会编译,因为void&是不合法的。但是std::reference_wrapper在封面下使用指针而不是引用,void*是一...
main.cpp:17:6: error: type 'double' cannot be narrowed to 'int' in initializer ⮠ list [-Wc++11-narrowing] S s2{a, 2, 3}; // error: narrowing ^ main.cpp:17:6: note: insert an explicit cast to silence this issue S s2{a, 2, 3}; // error: narrowing ^ static_cast<int>...
此处使用的std::pair的构造函数是: // Initializes first with std::forward<U1>(x) and second with std::forward<U2>(y).template< class U1 = T1, class U2 = T2 >constexpr pair( U1&& x, U2 setOnClickListener unresolved reference
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