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• C++ fixed point library?

  - by uj2

  I am looking for a free C++ fixed point library (Mainly for use with embedded devices, not for arbitrary precision math). Basically, the requirements are: No unnecessary runtime overhead: whatever can be done at compile time, should be done at compile time. Ability to transparently switch code between fixed and floating point, with no inherent overhead. Fixed point math functions. There's no much point using fixed point if you need to cast back and forth in order to take a square root. Small footprint. Any suggestions?

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• How does Android emulator performance compare to real device performance?

  - by uj2

  I'm looking into writing an Android game, tough I don't curerntly own an Android device. For those of you who own a device, how does the performance on the emulator relate to real device performance? I'm especially interested in graphics related tasks. This obviously depends on both the machine running the emulator, and the specific device in question, but I'm talking rough numbers here. This question is a duplicate, but since that post is heavily outdated, I figured it's irrelevant by now.

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• Repeating only a portion of a texture in OpenGL ES?

  - by uj2

  I know it's possible to repeat an entire texture by setting the wrap mode to GL_REPEAT, but is it somehow possible to repeat only a subregion of the texture? For example, when the texture is part of an atlas. I'm targetting OpenGL ES 1.x, so shaders are out.

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• Template class that refers to itself as a template template parameter?

  - by uj2

  This code: template <template <typename> class T> class A { }; template <typename T> class B { A<B> x; }; doesn't compile, I suppose since A<B> is interpreted as A<B<T> > within B's scope. So, how do you pass B as a template template parameter within it's scope?

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• Which of the C-family languages have a preprocessor?

  - by uj2

  Among the C-syntax family of languages (C, C++, Java, C#, ObjC, JS, AS, ...), which have a preprocessor compatible (to whatever extent) with the C preprocessor?

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• Argument type deduction, references and rvalues

  - by uj2

  Consider the situation where a function template needs to forward an argument while keeping it's lvalue-ness in case it's a non-const lvalue, but is itself agnostic to what the argument actually is, as in: template <typename T> void target(T&) { cout << "non-const lvalue"; } template <typename T> void target(const T&) { cout << "const lvalue or rvalue"; } template <typename T> void forward(T& x) { target(x); } When x is an rvalue, instead of T being deduced to a constant type, it gives an error: int x = 0; const int y = 0; forward(x); // T = int forward(y); // T = const int forward(0); // Hopefully, T = const int, but actually an error forward<const int>(0); // Works, T = const int It seems that for forward to handle rvalues (without calling for explicit template arguments) there needs to be an forward(const T&) overload, even though it's body would be an exact duplicate. Is there any way to avoid this duplication?

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• Specializing a template member function of a template class?

  - by uj2

  I have a template class that has a template member function that needs to be specialized, as in: template <typename T> class X { public: template <typename U> void Y() {} template <> void Y<int>() {} }; Altough VC handles this correctly, apperantly this isn't standard and GCC complains: explicit specialization in non-namespace scope 'class X<T>' I tried: template <typename T> class X { public: template <typename U> void Y() {} }; template <typename T> // Also tried `template<>` here void X<T>::Y<int>() {} But this causes both VC and GCC to complain. What's the right way to do this?

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• GCC doesn't like C++ style casts with spaces

  - by uj2

  I am porting some C++ code to GCC, and apperantly it isn't happy with C++ style casting when sapces are involved, as in unsigned int(-1), long long(ShortVar) etc... It gives an error: expected primary-expression before 'long'. Is there any way to make peace with GCC without going over each one of those and rewrite in c-style?

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• Strange GCC 'expected primary expression...' error

  - by uj2

  template <typename T> struct A { template <int I> void f(); }; template <typename T> void F(A<T> &a) { a.f<0>(); // expected primary-expression before ‘)’ token } int main() { A<int> a; a.f<0>(); // This one is ok. } What it's all about?

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• GCC: Compile to assembly with clarified correspondence to code?

  - by uj2

  When you break into the debugger in VS and open the disassembly window, each assembly fragment is displayed below it's corresponding code section (more or less). GCC with -S outputs only the stripped down assembly. Is there an option in GCC to show some correspondence to the original code? Source code is C++.

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