tweak StringOutputStream use
auto str = StringOutputStream()(bla) use form was not doing copy elision or move, but copy
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@@ -34,11 +34,11 @@
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#include <cstdlib>
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void user_warning_fn( png_structp png_ptr, png_const_charp warning_msg ){
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globalWarningStream() << "libpng warning: " << warning_msg << "\n";
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globalWarningStream() << "libpng warning: " << warning_msg << '\n';
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}
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void user_error_fn( png_structp png_ptr, png_const_charp error_msg ){
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globalErrorStream() << "libpng error: " << error_msg << "\n";
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globalErrorStream() << "libpng error: " << error_msg << '\n';
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longjmp( png_jmpbuf(png_ptr), 0 );
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}
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