cpp_features's Introduction

cpp_features

Demo of new C++ features (C++ 03, 11, 14) accross compiler.

Use CMake ctest to test for successful execution or expected compilation failure.

Good summary of C++17 features: https://stackoverflow.com/questions/38060436/what-are-the-new-features-in-c17

Test to do:

final with inheritance
func not in param decl
Template argument deduction for class templates
template <= infer any non type arg
Folding expression: http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4295.html
constexpr lambda
structured binding: http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0217r3.html; auto [x,y] = tuple or array
if (init; condition) and switch (init; condition)
Direct list-initialization of enums => custom int type enum class MyInt {}; MyInt value{5}; // < implicit conversion allowed.
variant
optional
string_view
invoke
apply
make_from_tuple
is_invokable
std::clamp // <= is generated code as good as non-branching code used in game?

Stuffs to investigate: inheriting_constructors.cpp:

when debugging, step into on SubDefault variable construction does not step into Base constructor
putting a break-point in Base constructor force compiler to break though.

Idea to explore: Can you use UDL to generate compile time string formatting ? "Hello %s!"fmt( "World" ); => no reasonnable until C++ 17 as currently constexpr must be recursive. => additional constexpr is not evaluated only once on all compilers

Experimental C++ 17 stuffs: https://www.visualstudio.com/en-us/news/vs2015-vs.aspx#C++

Resumable Functions (resume/await) The resume and await keywords provide language-level support for asynchronous programming and enables resumable functions. Currently, this feature is only available for x64 targets. Proposed for C++17 [N3858]

VS 2015 standard conformance (nearly all c++14 an a lot c++17): http://blogs.msdn.com/b/vcblog/archive/2015/06/19/c-11-14-17-features-in-vs-2015-rtm.aspx

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