Using ICC,
icc --version
icc (ICC) 14.0.1 20131008
`icc -std=c++11 test.cpp -o test`
the following code for test.cpp compiles
[cpp]
#include <functional>
#include <string>
struct widget {};
struct some_obj
{
std::function<widget(std::string, int)>
f1()
{
return [this](std::string, int val) { return widget{}; };
}
};
int main(){}
[/cpp]
so does this:
[cpp]
#include <functional>
#include <string>
struct widget {};
struct some_obj
{
std::function<widget(double)>
f2()
{
return [this](double d) { return widget{}; };
}
};
int main(){}
[/cpp]
but not this:
[cpp]
#include <functional>
#include <string>
struct widget {};
struct some_obj
{
std::function<widget(std::string, int)>
f1()
{
return [this](std::string, int val) { return widget{}; };
}
std::function<widget(double)>
f2()
{
return [this](double d) { return widget{}; };
}
};
int main() {}
[/cpp]
the error is this:
[plain]
test.cpp(17): error: no suitable user-defined conversion from "lambda [](double)->widget" to "std::function<widget (double)>" exists
return [this](double d) { return widget{}; };
[/plain]
In words, the class some_obj compiles with either function f1 or f2 as members but not both. All versions of this code work on both clang++3.4 and g++4.8 on the same platform with the same flags using the same standard library (libstdc++4.8.1).
Are lambdas not fully supported yet?
Thanks ~ ry
