https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61381
Bug ID: 61381
Summary: constexpr non captured by template lambda
Product: gcc
Version: 4.9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: vincenzo.innocente at cern dot ch
cat ceLambda.cc
struct Bar { constexpr Bar(float i):f(i){}; float f;};
float foo1(float x) {
constexpr Bar z{0};
auto f = [=](auto a, auto b) -> Bar { return z;};
return f(x,x).f;
}
float foo2(float x) {
const Bar z{0};
auto f = [=](auto a, auto b) -> Bar { return z;};
return f(x,x).f;
}
float foo3(float x) {
constexpr Bar z{0};
auto f = [=](float a, float b) -> Bar { return z;};
return f(x,x).f;
}
b-d-128-141-131-42:ctest innocent$ c++ -O2 -std=c++1y -S ceLambda.cc
ceLambda.cc: In instantiation of ‘foo1(float)::<lambda(auto:1, auto:2)> [with
auto:1 = float; auto:2 = float]’:
ceLambda.cc:7:16: required from here
ceLambda.cc:5:49: error: ‘z’ was not declared in this scope
auto f = [=](auto a, auto b) -> Bar { return z;};
^
