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Mark constants as constexpr, capture implicitly

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This commit is contained in:
Dmitry Marakasov 2017-06-30 21:12:53 +03:00
parent 310c545722
commit 867219a0a1
1 changed files with 3 additions and 3 deletions
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6
examples/audio_sine.cc
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@ -33,15 +33,15 @@ using namespace SDL2pp;
int main(int, char*[]) try {
SDL sdl(SDL_INIT_AUDIO);
const int samplerate = 48000;
float frequency = 2093.00f; // C7 tone
constexpr int samplerate = 48000;
constexpr float frequency = 2093.00f; // C7 tone
int64_t nsample = 0;
// Setup audio device, and provide callback which plays sine wave with specified frequency
AudioSpec spec(samplerate, AUDIO_S16SYS, 1, 4096);
// Open audio device
AudioDevice dev(NullOpt, 0, spec, [&nsample, frequency, samplerate](Uint8* stream, int len) {
AudioDevice dev(NullOpt, 0, spec, [&nsample](Uint8* stream, int len) {
// fill provided buffer with sine wave
for (Uint8* ptr = stream; ptr < stream + len; ptr += 2)
*(Uint16*)ptr = (Uint16)(32766.0f * sin(nsample++ / (float)samplerate * frequency));